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Table 4 a – Odds ratios (OR) and 95% confidence intervals (CI) for association of inadequate/no prenatal care with preterm birth (< 37 completed weeks gestation)*

From: Inadequate prenatal care and its association with adverse pregnancy outcomes: A comparison of indices

a – Odds ratios (OR) and 95% confidence intervals (CI) for association of inadequate/no prenatal care with preterm birth (< 37 completed weeks gestation)*
Index Unadjusted OR 95% CI Adjusted OR** 95% CI
APNCU Index 1.3 1.2 – 1.5 1.2 1.1 – 1.3
R-GINDEX 1.1 1.0 – 1.2 1.0 0.9 – 1.1
b – Odds ratios (OR) and 95% confidence intervals (CI) for association of inadequate/no prenatal care with low birth weight (<2500 grams)*
Index Unadjusted OR 95% CI Adjusted OR** 95% CI
APNCU Index 1.4 1.3 – 1.6 1.3 1.2 – 1.5
R-GINDEX 1.2 1.1 – 1.4 1.1 1.0 – 1.3
c – Odds ratios (OR) and 95% confidence intervals (CI) for association of inadequate/no prenatal care with small-for-gestational age (birth weight < 10 th percentile for gestational age)*
Index Unadjusted OR 95% CI Adjusted OR** 95% CI
APNCU Index 1.5 1.4 – 1.6 1.4 1.3 – 1.5
R-GINDEX 1.4 1.3 – 1.5 1.4 1.3 – 1.5
  1. * Inadequate/no prenatal care was compared to the reference group of all other types of care (intermediate, adequate and intensive).
  2. **Controlling for maternal age and parity, and adjusting for within-mother dependency. Maternal age was studied using categories of <20 years, 20–24 years, 25–29 years, 30–34 years, and 35+ years, with 35+ years as the reference group. Parity was studied using categories of first birth, 2nd-3rd birth and 4 or more births, with first birth as the reference group.
b – Odds ratios (OR) and 95% confidence intervals (CI) for association of inadequate/no prenatal care with low birth weight (<2500 grams)*c – Odds ratios (OR) and 95% confidence intervals (CI) for association of inadequate/no prenatal care with small-for-gestational age (birth weight < 10th percentile for gestational age)*