Prenatal exposure to extremely low frequency magnetic field and its impact on fetal growth

Table 4 Relationship between in-utero ELF-MF exposure and circumference of head, up arm and abdomen (cm) using GLM

MF measurements		All				Boys				Girls
MF measurements		N	\( \overline{x}\pm \mathrm{s} \)	P	P^#	N	\( \overline{x}\pm \mathrm{s} \)	P	P^#	N	\( \overline{x}\pm \mathrm{s} \)	P	P^#
Head circumference	TWA
	Below median	63	35.3 ± 1.2	0.13	0.16	29	35.5 ± 1.2	0.44	0.42	34	35.1 ± 1.1	0.07	0.08
	Above median	65	34.9 ± 1.3			35	35.2 ± 1.5			30	34.6 ± 0.9
	P50
	Below median	55	35.3 ± 1.2	0.12	0.06	26	35.5 ± 1.3	0.65	0.18	29	35.2 ± 1.1	0.02	0.02
	Above median	73	34.9 ± 1.3			38	35.3 ± 1.5			35	34.5 ± 0.9
	P75
	Below median	62	35.3 ± 1.2	0.18	0.08	26	35.5 ± 1.3	0.53	0.16	36	35.1 ± 1.1	0.04	0.06
	Above median	66	34.9 ± 1.3			38	35.3 ± 1.4			28	34.5 ± 0.9
Upper arm circumference	TWA
	Below median	63	11.3 ± 1.2	0.01	0.03	29	11.1 ± 1.1	0.26	0.17	34	11.5 ± 1.4	0.0262	0.05
	Above median	65	10.8 ± 0.9			35	10.8 ± 1.1			30	10.8 ± 0.7
	P50
	Below median	55	11.3 ± 1.3	0.03	0.03	26	11.1 ± 1.1	0.54	0.30	29	11.6 ± 1.5	0.0146	0.02
	Above median	73	10.9 ± 0.9			38	10.9 ± 1.1			35	10.8 ± 0.6
	P75
	Below median	62	11.3 ± 1.3	0.03	0.02	26	11.1 ± 1.1	0.57	0.26	36	11.5 ± 1.3	0.0200	< 0.05
	Above median	66	10.8 ± 0.9			38	10.9 ± 1.1			28	10.8 ± 0.7
Abdominal circumference	TWA
	Below median	63	33.9 ± 2.0	0.10	0.03	29	33.6 ± 2.2	0.87	0.54	34	34.3 ± 1.9	< 0.01	0.03
	Above median	65	33.3 ± 1.8			35	33.7 ± 1.9			30	32.9 ± 1.6
	P50
	Below median	55	33.9 ± 2.1	0.24	0.11	26	33.5 ± 2.2	0.72	0.55	29	34.2 ± 2.1	0.03	0.04
	Above median	73	33.4 ± 1.8			38	33.7 ± 2.0			35	33.1 ± 1.5
	P75
	Below median	62	33.9 ± 2.0	0.19	< 0.05	26	33.6 ± 2.2	0.86	0.34	36	34.1 ± 1.9	0.03	0.06
	Above median	66	33.4 ± 1.8			38	33.7 ± 2.0			28	33.0 ± 1.6

^#Adjusting for family income, gestational age, parity, parental age at childbirth, parental BMI before pregnancy, and maternal passive smoking during pregnancy

ISSN: 1476-069X