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Table 3 Multivariate logistic analyses showing the outcomes associated with preterm low birth weight

From: Association between maternal lifestyle factors and low birth weight in preterm and term births: a case-control study

Variable   Reference P Crude OR Adjusted ORa 95%CI
Physical activity (/week) 1–3 No 0.008 0.630 0.584 0.394–0.867
≥4   0.001 0.601 0.516 0.355–0.752
Gestational gain Less Normal < 0.001 2.338 2.272 1.626–3.176
More   0.329 0.986 0.811 0.532–1.236
Age (years) ≤18 19–34 0.481 1.418 0.551 0.161–1.882
≥35   < 0.001 1.713 2.486 1.599–3.865
Parity >1 1 < 0.001 0.330 0.273 0.192–0.389
History of LBW Yes No < 0.001 5.279 5.517 2.831–10.750
Antenatal care 5–9 ≤4 0.010 0.553 0.593 0.398–0.884
10–14   < 0.001 0.093 0.083 0.049–0.141
≥15   < 0.001 0.056 0.044 0.010–0.198
Gestational hypertension Yes No < 0.001 6.377 9.062 5.327–15.415
  1. Note: OR odds ratio; CI confidence interval; LBW low birth weight Control: normal weight term baby
  2. aVariables in the logistic regression include maternal characteristics, pre-pregnancy BMI, parity, history of LBW, antenatal care, fetal sex and gestational hypertension