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Table 3 Regression of fetal parameters on group random intercept model*

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

Fetal parameters Coefficient 95% Confidence Interval p-value
BPD
 Randomization group − 0.010 − 0.066 to 0.046 0.736
 Gestational age (weeks) 0.390 0.375 to 0.405 < 0.001
 Gestational age2 − 0.003 − 0.003 to − 0.002 < 0.001
HC
 Randomization group 0.008 −0.185 to 0.169 0.926
 Gestational age (weeks) 1.504 1.450 to 1.557 < 0.001
 Gestational age2 −0.012 −0.013 to − 0.011 < 0.001
FL
 Randomization group −0.013 −0.060 to 0.034 0.586
 Gestational age (weeks) 0.313 0.301 to 0.325 < 0.001
 Gestational age2 −0.002 −0.002 to − 0.001 < 0.001
AC
 Randomization group 0.027 −0.199 to 0.253 0.817
 Gestational age (weeks) 0.988 0.933 to 1.044 < 0.001
 Gestational age2 0.0002 −0.001 to 0.001 0.747
U-EFW
 Randomization group −5.336 −27.589 to 16.917 0.638
 Gestational age (weeks) −120.744 − 127.529 to −113.959 < 0.001
 Gestational age2 4.738 4.610 to 4.866 < 0.001
  1. SE standard error; BPD biparietal diameter; HC head circumference; FL fetal length; AC abdominal circumference; U-EFW ultrasound-estimated fetal weight
  2. *Adjusted for mother’s age, body mass index, marital status, educational level, number of children, history of stillbirth, and history of miscarriage