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Table 2 Comparisons of maternal pre-pregnancy BMI and GWG between the case and control groups

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

  Control Case Value df p
(n = 2200) (n = 697)
1. BMI (kg/m2), mean (SD) 20.30 (2.27) 20.50 (2.25) −2.015 2895 0.044
2. BMI categories, n (%)    
Underweight 466 (21.2%) 122 (17.5%) 4.841 3 0.184
Normal 1580 (71.8%) 523 (75.0%)    
Overweight 141 (6.4%) 49 (7.0%)    
Obese 13 (0.6%) 3 (0.5%)    
3. GWG (kg), mean (SD) 15.04(5.81) 15.70 (6.21) −2.526 2895 0.012
4. GWG categories, n (%)    
Inadequate 793 (36.0%) 226 (32.4%) 7.912 2 0.019
Adequate 344 (15.6%) 139 (19.9%)    
Excessive 1063 (48.4%) 332 (47.7%)    
  1. BMI body mass index, GWG gestation weight gain