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Table 6 Odds ratios (OR) for association of inadequate/no prenatal care with LBW (<2500 grams) by gestational age category: Comparison of two prenatal care utilization indices.

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

Gestation Total n LBW n APNCU OR R-GINDEX OR
<27 weeks 263 262 ne* ne*
27–28 177 172 ne* ne*
29–30 186 177 0.28 0.43
31–32 403 380 0.72 1.03
33–34 865 646 0.85 1.02
35–36 2 926 954 1.19 1.22
37–38 16 024 762 1.48 1.36
39–40 45 115 445 1.64 1.45
41–42 14 964 60 2.85 3.45
43–44 66 0 ne* ne*
Breslow-Day Test   p = 0.0159 p = 0.0624
  1. *ne = not estimable.