<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7434</journal-id>
<journal-title><![CDATA[Revista Colombiana de Obstetricia y Ginecología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Colomb Obstet Ginecol]]></abbrev-journal-title>
<issn>0034-7434</issn>
<publisher>
<publisher-name><![CDATA[Federación Colombiana de Obstetricia y GinecologíaRevista Colombiana de Obstetricia y Ginecología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74342018000100022</article-id>
<article-id pub-id-type="doi">10.18597/rcog.3034</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Prevalence of late initiation of prenatal care. Association with the socioeconomic level of the pregnant woman. Cross-sectional study. Bucaramanga, Colombia, 2014-2015]]></article-title>
<article-title xml:lang="es"><![CDATA[Prevalencia de inicio tardío de la atención prenatal. Asociación con el nivel socioeconómico de la gestante. Estudio de corte transversal. Bucaramanga, Colombia, 2014-2015]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cáceres-Manrique]]></surname>
<given-names><![CDATA[Flor de María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Rodríguez]]></surname>
<given-names><![CDATA[Myriam]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Industrial University of Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Industrial University of Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2018</year>
</pub-date>
<volume>69</volume>
<numero>1</numero>
<fpage>22</fpage>
<lpage>31</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74342018000100022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74342018000100022&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74342018000100022&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Objective: To describe the prevalence of late initiation of prenatal care and assess its association with the socioeconomic level of the pregnant woman.  Materials and methods: Cross-sectional study. Pregnant women from the urban area of Bucaramanga were included using sampling based on proportional affixation quotas according to the socioeconomic classification of the neighbourhood where they lived. Late initiation was considered to occur when prenatal care was started at 12 weeks or more of gestation. The association between late initiation and socioeconomic bracket was assessed, controlling by sociodemographic and clinical variables of the pregnant woman, and a multivariate log-binomial regression model was developed to estimate prevalence ratios and their 95% confidence intervals (95% CI).  Results: Overall, 391 pregnant women between 18 and 43 years of age (median 23) were included. Median for schooling was 11 years, with a range between 0 and 25 years. Late initiation was found in 29.7% (95% CI: 25.2-34.5) of the women. Association was found with low income brackets (prevalence ratio [PR] = 1.57; 95% CI: 1.082.56), no affiliation to social security at the start of pregnancy (PR = 2.73; 95% CI: 2.04-3.67), and low schooling (PR = 1.46; 95% CI: 1.02-2.16), and age between 18 and 24 years (PR = 1.53; 95% CI: 1.12-1.70). Remembering the date of the last menstruation (PR = 0.48; 95% CI: 0.32-0.71) and being in a stable relationship (PR = 0.82; 95% CI: 0.64-0.98) were protective factors.  Conclusions: Late initiation of prenatal care is found to occur in approximately one out of every three pregnant women. Late initiation is associated with living in a low socioeconomic bracket. Early identification of pregnant women in this population affected by health inequity must be improved.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Objetivo: Describir la prevalência del inicio tardío de la atención prenatal y evaluar su asociación con el estrato socioeconómico donde habita la gestante.  Materiales y métodos: Estudio de corte transversal. Se incluyeron gestantes procedentes del área urbana de Bucaramanga, seleccionadas por muestreo por cuotas con afijación proporcional por estrato socioeconómico, según la clasificación socioeconómica del barrio donde habitan. Se consideró inicio tardío haber comenzado atención prenatal (APN) a las 12 semanas o más de gestación. Se evaluó asociación del inicio tardío con el estrato socioeconómico, controlando por variables sociodemográficas y clínicas de la gestante, y se elaboró un modelo de regresión log-binomial multivariada para estimar las razones de prevalencia con sus intervalos de confianza del 95 % (IC 95 %).  Resultados: Se incluyeron 391 gestantes, con edades entre 18 y 43 años, mediana 23 años; respecto a la escolaridad la mediana fue de 11 años con un rango entre 0 y 25 años. El inicio tardío se dio en el 29,7 % (IC 95 %: 25,2-34,5) de las gestantes. Estuvo asociado con estrato bajo. Razón de prevalencias ([RP] = 1,57; IC 95 %: 1,08-2,56), falta de afiliación a la seguridad social al inicio del embarazo (RP = 2,73; IC 95 %: 2,04-3,67), la baja escolaridad (RP = 1,46; IC 95 %: 1,02-2,16) y la edad entre 18 y 24 años (RP= 1,53; IC 95 %: 1,12-1,70). Fueron factores protectores el recordar la fecha de la última regla (RP = 0,48; IC 95 %: 0,32-0,71) y tener pareja estable (RP = 0,82; IC 95 %: 0,64-0,98).  Conclusiones: Cerca de una de cada tres gestantes inicia tarde su APN. El inicio tardío está asociado con vivir en estrato socioeconómico bajo. Se requiere mejorar la captación temprana de las gestantes en esta población que presenta condiciones de inequidad en salud.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[prenatal care]]></kwd>
<kwd lng="en"><![CDATA[pregnant women]]></kwd>
<kwd lng="en"><![CDATA[gestational age]]></kwd>
<kwd lng="en"><![CDATA[healthcare]]></kwd>
<kwd lng="en"><![CDATA[socioeconomic factors]]></kwd>
<kwd lng="en"><![CDATA[social security]]></kwd>
<kwd lng="en"><![CDATA[Colombia]]></kwd>
<kwd lng="es"><![CDATA[atención prenatal]]></kwd>
<kwd lng="es"><![CDATA[mujeres embarazadas]]></kwd>
<kwd lng="es"><![CDATA[edad gestacional]]></kwd>
<kwd lng="es"><![CDATA[atención en salud]]></kwd>
<kwd lng="es"><![CDATA[factores socioeconómicos]]></kwd>
<kwd lng="es"><![CDATA[seguridad social]]></kwd>
<kwd lng="es"><![CDATA[Colombia]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="">
<collab>Colombia. Ministerio de Salud. Colciencias</collab>
<source><![CDATA[Guía de práctica clínica para la prevención, detección temprana y tratamiento de las complicaciones del embarazo, parto o puerperio]]></source>
<year>2013</year>
</nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="">
<collab>República de Colombia, Ministerio de Salud</collab>
<source><![CDATA[Norma técnica para la deteción temprana de las alteraciones del embarazo]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Anwar]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Sami]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Akhtar]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Chowdhury]]></surname>
<given-names><![CDATA[ME]]></given-names>
</name>
<name>
<surname><![CDATA[Salma]]></surname>
<given-names><![CDATA[U]]></given-names>
</name>
<name>
<surname><![CDATA[Rahman]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Inequity in maternal health-care services: Evidence from home-based skilled-birth-attendant programs in Bangladesh]]></article-title>
<source><![CDATA[Bulletin of the World Health Organization]]></source>
<year>2008</year>
<volume>86</volume>
<page-range>252-9</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rodríguez-Villamizar]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Ruiz-Rodríguez]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Jaime García]]></surname>
<given-names><![CDATA[ML]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Beneficios de combinar métodos para analizar causas de muertes maternas, Bucaramanga, Colombia]]></article-title>
<source><![CDATA[Rev Panam Salud Publica]]></source>
<year>2011</year>
<volume>29</volume>
<page-range>213-9</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rowe]]></surname>
<given-names><![CDATA[RE]]></given-names>
</name>
<name>
<surname><![CDATA[Garcia]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Social class, ethnicity and attendance for antenatal care in the United Kingdom: A systematic review]]></article-title>
<source><![CDATA[J Public Health Med]]></source>
<year>2003</year>
<volume>25</volume>
<page-range>113-9</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Corbett]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Chelimo]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Okesene-Gafa]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Barriers to early initiation of antenatal care in a multi-ethnic sample in South Auckland, New Zealand]]></article-title>
<source><![CDATA[N Z Med J]]></source>
<year>2014</year>
<volume>127</volume>
<page-range>53-61</page-range></nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sinyange]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Sitali]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Jacobs]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Musonda]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Michelo]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Factors associated with late antenatal care booking: population based observations from the 2007 Zambia demographic and health survey]]></article-title>
<source><![CDATA[Pan Afr Med J]]></source>
<year>2016</year>
<volume>25</volume>
<page-range>109</page-range></nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fobelets]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Beeckman]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Hoogewys]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Embo]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Buyl]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Putman]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Predictors of late initiation for prenatal care in a metropolitan region in Belgium. A cohort study]]></article-title>
<source><![CDATA[M. Public Health]]></source>
<year>2015</year>
<volume>129</volume>
<page-range>648-54</page-range></nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Beeckman]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Louckx]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Putman]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Predisposing, enabling and pregnancy-related determinants of late initiation of prenatal care]]></article-title>
<source><![CDATA[Matern Child Health J]]></source>
<year>2011</year>
<volume>15</volume>
<page-range>1067-75</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zegeye]]></surname>
<given-names><![CDATA[AM]]></given-names>
</name>
<name>
<surname><![CDATA[Bitew]]></surname>
<given-names><![CDATA[BD]]></given-names>
</name>
<name>
<surname><![CDATA[Koy]]></surname>
<given-names><![CDATA[DN]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Prevalence and determinants of early antenatal care visit among pregnant women attending antenatal care in debre berhan health institutions, central ethiopia]]></article-title>
<source><![CDATA[AJRH]]></source>
<year>2013</year>
<volume>17</volume>
<page-range>130</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cresswell]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Yu]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Hatherall]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Morris]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Jamal]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Harden]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Predictors of the timing of initiation of antenatal care in an ethnically diverse urban cohort in the UK]]></article-title>
<source><![CDATA[BMC Pre gnancy and Childbirth]]></source>
<year>2013</year>
<volume>13</volume>
<page-range>103</page-range></nlm-citation>
</ref>
<ref id="B12">
<label>12</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Feijen-de Jon]]></surname>
<given-names><![CDATA[EI]]></given-names>
</name>
<name>
<surname><![CDATA[Jansen]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Baarveld]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[van der Schans]]></surname>
<given-names><![CDATA[CP]]></given-names>
</name>
<name>
<surname><![CDATA[Ois]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Schellevis]]></surname>
<given-names><![CDATA[FG]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Determinants of late and/or inadequate use of prenatal healthcare in high-income countries: a systematic review]]></article-title>
<source><![CDATA[Eur J Public Health]]></source>
<year>2011</year>
<volume>22</volume>
<page-range>904-13</page-range></nlm-citation>
</ref>
<ref id="B13">
<label>13</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Heredia-Pi]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Servan-Mori]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Darney]]></surname>
<given-names><![CDATA[BG]]></given-names>
</name>
<name>
<surname><![CDATA[Reyes-Morales]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Lozano]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Measuring the adequacy of antenatal health care: A national cross-sectional study in Mexico]]></article-title>
<source><![CDATA[Bull World Health Organ]]></source>
<year>2016</year>
<volume>94</volume>
<page-range>452-61</page-range></nlm-citation>
</ref>
<ref id="B14">
<label>14</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aung]]></surname>
<given-names><![CDATA[TZ]]></given-names>
</name>
<name>
<surname><![CDATA[Oo]]></surname>
<given-names><![CDATA[WM]]></given-names>
</name>
<name>
<surname><![CDATA[Khaing]]></surname>
<given-names><![CDATA[W]]></given-names>
</name>
<name>
<surname><![CDATA[Dar]]></surname>
<given-names><![CDATA[TH]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Late initiation of antenatal care and its determinants: A hospital based cros s-sectional study]]></article-title>
<source><![CDATA[IJCMPH]]></source>
<year>2016</year>
<volume>3</volume>
<page-range>900-5</page-range></nlm-citation>
</ref>
<ref id="B15">
<label>15</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Say]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Raine]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A systematic review of inequalities in the use of maternal health care in developing countries: Examining the scale of the problem and the importance of context]]></article-title>
<source><![CDATA[Public Health Reviews. Bulletin WHO]]></source>
<year>2007</year>
<volume>85</volume>
<page-range>812-9</page-range></nlm-citation>
</ref>
<ref id="B16">
<label>16</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Miranda Mellado]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Factores de capacidad en el uso de control prenatal adecuado en gestantes de Sincelejo]]></article-title>
<source><![CDATA[Salud Uninorte]]></source>
<year>2016</year>
<volume>32</volume>
<page-range>436-51</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>17</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Moya-Plata]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Guiza-Salazar]]></surname>
<given-names><![CDATA[IJ]]></given-names>
</name>
<name>
<surname><![CDATA[Mora-Merchán]]></surname>
<given-names><![CDATA[MA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Ingreso temprano al control prenatal en una unidad materno infantil]]></article-title>
<source><![CDATA[Rev Cuid]]></source>
<year>2010</year>
<volume>1</volume>
<page-range>44-52</page-range></nlm-citation>
</ref>
<ref id="B18">
<label>18</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ortiz]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Anaya]]></surname>
<given-names><![CDATA[NI]]></given-names>
</name>
<name>
<surname><![CDATA[Sepúlveda]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[SJ]]></given-names>
</name>
<name>
<surname><![CDATA[Camacho]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Caracterización de las adolescentes gestantes de Bucaramanga, Colombia. Un estudio transversal]]></article-title>
<source><![CDATA[MedUnab]]></source>
<year>2005</year>
<volume>8</volume>
<page-range>71-7</page-range></nlm-citation>
</ref>
<ref id="B19">
<label>19</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rodríguez-Páez]]></surname>
<given-names><![CDATA[FG]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez-Barbosa]]></surname>
<given-names><![CDATA[WG]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez-González]]></surname>
<given-names><![CDATA[CA]]></given-names>
</name>
<name>
<surname><![CDATA[Coral-Córdoba]]></surname>
<given-names><![CDATA[AE]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez-Solano]]></surname>
<given-names><![CDATA[PC]]></given-names>
</name>
<name>
<surname><![CDATA[Ramos-Navas]]></surname>
<given-names><![CDATA[NR]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Efecto de las barreras de acceso sobre la asistencia a citas de programa de control prenatal y desenlaces perinatales]]></article-title>
<source><![CDATA[Rev Gerenc Polít Salud]]></source>
<year>2014</year>
<volume>13</volume>
<page-range>212-27</page-range></nlm-citation>
</ref>
<ref id="B20">
<label>20</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aguado]]></surname>
<given-names><![CDATA[LF]]></given-names>
</name>
<name>
<surname><![CDATA[Girón]]></surname>
<given-names><![CDATA[LE]]></given-names>
</name>
<name>
<surname><![CDATA[Osorio]]></surname>
<given-names><![CDATA[AM]]></given-names>
</name>
<name>
<surname><![CDATA[Tovar]]></surname>
<given-names><![CDATA[LM]]></given-names>
</name>
<name>
<surname><![CDATA[Ahumada]]></surname>
<given-names><![CDATA[JR]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Determinantes del uso de los servicios de salud materna en el Litoral Pacífico colombiano]]></article-title>
<source><![CDATA[Rev Latinoam Cienc Soc Niñez Juv]]></source>
<year>2007</year>
<volume>5</volume>
<page-range>1-3</page-range></nlm-citation>
</ref>
<ref id="B21">
<label>21</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ruiz]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Cristancho]]></surname>
<given-names><![CDATA[LP]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Características del programa de control prenatal en instituciones de salud públicas de Bucaramanga]]></article-title>
<source><![CDATA[Médicas UIS]]></source>
<year>2001</year>
<volume>15</volume>
<page-range>159-68</page-range></nlm-citation>
</ref>
<ref id="B22">
<label>22</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brice-o-Ayala]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Pinzón-Rondón]]></surname>
<given-names><![CDATA[AM]]></given-names>
</name>
<name>
<surname><![CDATA[Zárate-Ardila]]></surname>
<given-names><![CDATA[CJ]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Acceso, seguridad e integralidad en registros de gestantes colombianas entre los años 2007 al 2009]]></article-title>
<source><![CDATA[Rev Cienc Salud]]></source>
<year>2015</year>
<volume>13</volume>
<page-range>355-67</page-range></nlm-citation>
</ref>
<ref id="B23">
<label>23</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Miranda]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Castillo]]></surname>
<given-names><![CDATA[IY]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Factores de necesidad asociados al uso adecuado del control prenatal]]></article-title>
<source><![CDATA[Rev Cuid]]></source>
<year>2016</year>
<volume>7</volume>
<page-range>1345-51</page-range></nlm-citation>
</ref>
<ref id="B24">
<label>24</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Castillo]]></surname>
<given-names><![CDATA[IY]]></given-names>
</name>
<name>
<surname><![CDATA[Fortich]]></surname>
<given-names><![CDATA[LM]]></given-names>
</name>
<name>
<surname><![CDATA[Padilla]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Monroy]]></surname>
<given-names><![CDATA[MA]]></given-names>
</name>
<name>
<surname><![CDATA[Morales]]></surname>
<given-names><![CDATA[Y]]></given-names>
</name>
<name>
<surname><![CDATA[Ahumada]]></surname>
<given-names><![CDATA[AM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Factores asociados al uso adecuado del control prenatal en 13 municipios de Bolívar, Colombia]]></article-title>
<source><![CDATA[Rev Cubana Enfermer]]></source>
<year>2017</year>
<volume>33</volume>
</nlm-citation>
</ref>
<ref id="B25">
<label>25</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vecino-Ortiz]]></surname>
<given-names><![CDATA[AI]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Determinants of demand for antenatal care in Colombia]]></article-title>
<source><![CDATA[Health Policy]]></source>
<year>2008</year>
<volume>86</volume>
<page-range>363-72</page-range></nlm-citation>
</ref>
<ref id="B26">
<label>26</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Sample surveys]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Gail]]></surname>
<given-names><![CDATA[MH]]></given-names>
</name>
<name>
<surname><![CDATA[Benichou]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Editors. Encyclopedia of Epidemiologic Methods. Armitage P, Colton T]]></source>
<year>2000</year>
<page-range>794-812</page-range><publisher-loc><![CDATA[Sussex ]]></publisher-loc>
<publisher-name><![CDATA[Wiley and Sons]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B27">
<label>27</label><nlm-citation citation-type="">
<collab>CDC</collab>
<source><![CDATA[Epi-InfoTM]]></source>
<year>2017</year>
</nlm-citation>
</ref>
<ref id="B28">
<label>28</label><nlm-citation citation-type="">
<source><![CDATA[Bucaramanga. Plan de Ordenamiento Territorial]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B29">
<label>29</label><nlm-citation citation-type="">
<collab>Colombia, Departamento Administrativo Nacional de Estadística (DANE)</collab>
<source><![CDATA[Estratificación socioeconómica para servicios públicos domiciliarios]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B30">
<label>30</label><nlm-citation citation-type="">
<collab>Colombia. Departamento Nacional de Planeación</collab>
<collab>Ministerio de Hacienda y Crédito Público</collab>
<source><![CDATA[Evaluación de la estratificación socioeconómica como instrumento de clasificación de los usuarios y herramienta de asignación de subsidios y contribuciones a los servicios públicos domiciliarios. Informe institucional, enero 10 de 2008]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B31">
<label>31</label><nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barros]]></surname>
<given-names><![CDATA[AJD]]></given-names>
</name>
<name>
<surname><![CDATA[Hirakata]]></surname>
<given-names><![CDATA[VN]]></given-names>
</name>
</person-group>
<source><![CDATA[Alternatives for logistic regression in cross-sectional studies: An empirical comparison of mode ls that directly estimate the prevalence ratio]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B32">
<label>32</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Espelt]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Marí-Dell'Olmo]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Penelo]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Bosque-Prous]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estimación de las razones de prevalencia con distintos modelos de regresión: ejemplo de un estudio internacional en investigación de las adicciones]]></article-title>
<source><![CDATA[Adicciones]]></source>
<year>2017</year>
<volume>29</volume>
<page-range>105-12</page-range></nlm-citation>
</ref>
<ref id="B33">
<label>33</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Andersen]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Revisiting the behavioral model and access to medical care: Does it matter?]]></article-title>
<source><![CDATA[J Health Soc Behav]]></source>
<year>1995</year>
<volume>36</volume>
<page-range>1-10</page-range></nlm-citation>
</ref>
<ref id="B34">
<label>34</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Travassos]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Martins]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A review of concepts in health services access and utilization]]></article-title>
<source><![CDATA[Cad Saúde Pública]]></source>
<year>2004</year>
<volume>20</volume>
<numero>^s2</numero>
<issue>^s2</issue>
<supplement>2</supplement>
<page-range>S190-8</page-range></nlm-citation>
</ref>
<ref id="B35">
<label>35</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Poeran]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Maas]]></surname>
<given-names><![CDATA[AFG]]></given-names>
</name>
<name>
<surname><![CDATA[Birnie]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Denktas]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Steegers]]></surname>
<given-names><![CDATA[EAP]]></given-names>
</name>
<name>
<surname><![CDATA[Bonsel]]></surname>
<given-names><![CDATA[GJ]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Social deprivation and adverse perinatal outcomes among Western and Non-Western pregnant women in a Dutch urban population]]></article-title>
<source><![CDATA[Soc Sci Med]]></source>
<year>2013</year>
<volume>83</volume>
<page-range>42-9</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
