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Table 2 Regression formula used to generate ultrasound biometry charts and tables of biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), femur length (FL), and estimated fetal weight (EFW)

From: Fetal growth restriction in rural Bangladesh: a prospective study

BPD  
 Mean = − 24.624 + 3.739* GA - 0.0004972* GA3  
 SD = 1.994 + 0.053* GA  
HC  
 Mean = − 94.476 + 14.273* GA - 0.0020276* GA3  
 SD = 8.182 + 0.121*GA  
AC  
 Mean = − 78.497 + 11.708* GA - 0.0009802* GA3  
 SD = 2.059 + 0.461* GA  
FL  
 Mean = − 32.653 + 3.499* GA - 0.0005433* GA3  
 SD = 1.975 + 0.028* GA  
EFW  
 Mean = 0.0095699*GA**4.4937733  
 SD = 0.00265083*GA**3.287346  
  1. Abbreviation: GA gestational age, SD standard deviation