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Table 4 Odds ratios and 95% confidence intervals for the association between GWG and autism in different maternal pre-pregnancy BMI categories

From: Associations among maternal pre-pregnancy body mass index, gestational weight gain and risk of autism in the Han Chinese population

  OR 95% CI p
Underweighta
 Inadequate weight gain 1.164 0.726–1.866 0.530
 Excessive weight gain 1.016 0.502–2.055 0.965
Normala
 Inadequate weight gain 0.784 0.609–1.010 0.059
 Excessive weight gain 1.289 0.947–1.754 0.107
Overweight/Obesea
 Inadequate weight gain 0.548 0.193–1.559 0.260
 Excessive weight gain 2.468 1.102–5.526 0.028
  1. BMI body mass index, GWG gestation weight gain
  2. Child’s gender, child age, parental age, and family annual income were used as covariates
  3. aAdequate weight gain group was used as a reference