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Table 5 Odds ratios (OR) for association of inadequate/no prenatal care with SGA 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 SGA n APNCU OR R-GINDEX OR
<27 weeks 263 57 ne* ne*
27–28 177 22 0.82 1.84
29–30 186 20 1.31 0.92
31–32 403 38 0.23 0.25
33–34 865 78 0.27 0.77
35–36 2 926 321 0.81 0.89
37–38 16 024 1 352 1.40 1.38
39–40 45 115 4 515 1.48 1.47
41–42 14 964 1 552 1.80 1.64
43–44 66 9 2.71 1.73
Breslow-Day Test   p = 0.0001 p = 0.0154
  1. *ne = not estimable.