Skip to main content

Table 2 Summary statistics for fetal parameters by gestational age and group (control/intervention)

From: Household air pollution, ultrasound measurement, fetal biometric parameters and intrauterine growth restriction

    Control      Intervention   
Gestational age (weeks) BPD HC FL AC U-EFW BPD HC FL AC U-EFW
13 weeks
 Mean 2.9 10.7 1.6 8.9 120.9 3.0 11.0 1.7 9.1 125.4
 SD 0.7 2.6 0.6 2.3 48.5 0.7 2.5 0.6 2.3 60.2
 n 108 103 103 104 97 104 100 99 100 95
20 weeks
 Mean 4.8 17.6 3.3 15.2 357.9 4.7 17.4 3.3 15.1 340.4
 SD 0.4 1.3 0.3 1.4 97.6 0.3 1.0 0.3 1.1 57.4
 n 154 154 154 154 150 147 147 147 147 147
26 weeks
 Mean 6.5 24.0 4.9 21.6 911.2 6.5 23.8 4.8 21.5 887.3
 SD 0.3 1.1 0.2 1.2 135.4 0.3 1.1 0.3 1.3 120.0
 n 145 145 145 145 143 148 148 148 148 145
30 weeks
 Mean 7.6 27.7 5.8 25.9 1525.0 7.5 27.7 5.8 25.9 1529.2
 SD 0.3 0.9 0.3 1.2 203.5 0.4 1.2 0.3 1.5 223.5
 n 145 145 145 145 144 149 149 149 149 148
34 weeks
 Mean 8.4 30.5 6.6 29.8 2295.6 8.4 30.5 6.6 29.9 2315.1
 SD 0.3 1.0 0.3 1.6 277.0 0.4 1.2 0.3 1.5 288.2
 n 140 140 139 140 140 150 150 150 150 148
38 weeks
 Mean 8.9 32.4 7.3 33.1 3061.7 8.9 32.4 7.2 33.1 3042.7
 SD 0.4 1.1 0.3 1.6 324.3 0.4 1.2 0.3 1.9 374.2
 n 113 113 113 113 112 120 120 120 120 116
  1. n number; SD standard deviation; BPD biparietal diameter; HC head circumference; FL fetal length; AC abdominal circumference; U-EFW ultrasound-estimated fetal weight