Crude and adjusted associations between the immigrant status, other predefined variables (social risk factors and compliance with prenatal care), and the risk of neonatal morbidity (low weight).

a Newborn less than 2,500 grams at birthb 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.