Abstract: a Newborn less than 2,500 grams at birth.- b Odds Ratio and 95% Confidence Intervals. ORc denotes ?crude Odds ratio? = the basic regression model adding only the frequency matching variable: Primary Health Center (PHC)..- c ORa1 denotes ?adjusted? OR adding to the basic model: immigrant status and social risk factors..- d ORa2 denotes ?adjusted? OR adding to the basic model: immigrant status and prenatal care..- e ORa3 denotes ?adjusted? OR adding to the basic model: immigrant status, social risk factors, and prenatal care..- f ORa4 denotes ?adjusted? OR adding to the basic model: immigrant status, social risk factors, prenatal care, maternal age at delivery (continuous), and number of previous pregnancies (continuous)..- g African immigran women (Sub-Saharan and North-African combined).- h Referral to a social worker because of social risk factor detection..- i Prenatal care as assessed by KI: Adequate: first consultation before week 14 and at least 9 consultations during gestation. Inadequate: start of care after week 28, or less than 4 consultations during gestation. Intermediate: the other combinations..- j Prenatal care as assessed by OI: Adequate: all 7 indicators of the Spanish Health Service pregnancy care protocol met. Inadequate: ?4 indicators unmet. Intermediate: 1?3 indicators unmet. Cantabria (Spain): African immigrants and Spanish women 2007?2010.

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