. Author manuscript; available in PMC: 2015 Jan 1.

Published in final edited form as: J Matern Fetal Neonatal Med. 2013 Jun 20;27(1):89–93. doi: 10.3109/14767058.2013.806474

Table 2.

Effect of Maternal BMI on the Accuracy of Clinical EFW

BMI	<25 kg/m² (n=517)	25.0-29.9 kg/m² (n=1,234)	30.0-34.9 kg/m² (n=1,066)	≥35 kg/m² (n=980)	p-value
Absolute Error (grams) ^*	331g ± 257	336g ± 268	352g ± 281	365g ± 277	0.90
Absolute Error >500 grams	24.9%	22.9%	25.1%	26.6%	0.25
Absolute Percent Error ^*	11.2 ± 9.3	10.7 ± 9.3	11.0 ± 9.8	11.5 ± 9.8	0.57
Absolute Percent Error >10%	44.1%	44.4%	43.3%	47.4%	0.27
Absolute Percent Error >20%	17.2%	14.3%	14.8%	15.8%	0.45

Data expressed as mean ± standard deviation

BMI=body mass index; EFW=estimated fetal weight