Table 4. Comparisons of estimated body growth per day after adjusting for confounders among 4 dioxin groups.

Percentile of PCDDs/Fs-TEQ (pg/gfat)				<25		25–50			50–75			≥75
Observation period	Gender	Parameter	Unit	Mean	SE	Mean	SE	p	Mean	SE	p	Mean	SE	p
Birth to 1 month	Boys	N		29		36			28			25
		Weight	g/day	42.4	2.4	42.1	2.1		41.6	2.3		34.7	2.7	a,b
		Length	cm/day	0.20	0.01	0.18	0.01		0.22	0.01	b	0.20	0.02
		Head	cm/day	0.12	0.01	0.12	0.01		0.13	0.01		0.12	0.01
		Abdominal	cm/day	0.17	0.02	0.21	0.01		0.21	0.02		0.18	0.02
	Girls	N		22		16			24			27
		Weight	g/day	34.9	2.3	33.5	2.5		31.9	2.1		28.5	2.0	a
		Length	cm/day	0.19	0.02	0.21	0.02		0.18	0.02		0.18	0.02
		Head	cm/day	0.12	0.01	0.12	0.01		0.11	0.01		0.09	0.01
		Abdominal	cm/day	0.17	0.02	0.18	0.02		0.19	0.02		0.15	0.02
1 to 4 months	Boys	N		29		36			28			25
		Weight	g/day	28.4	2.0	28.1	1.7		29.4	2.0		22.8	2.2	c
		Length	cm/day	0.13	0.02	0.11	0.02		0.09	0.02		0.08	0.02
		Head	cm/day	0.07	0.01	0.06	0.01		0.05	0.01		0.04	0.01
		Abdominal	cm/day	0.07	0.01	0.06	0.01		0.06	0.01		0.03	0.02	a
	Girls	N		22		16			24			27
		Weight	g/day	21.7	1.9	22.2	2.0		25.5	1.7		26.2	1.6
		Length	cm/day	0.08	0.02	0.08	0.02		0.10	0.02		0.11	0.02
		Head	cm/day	0.04	0.01	0.04	0.01		0.05	0.01		0.06	0.01
		Abdominal	cm/day	0.04	0.01	0.04	0.01		0.05	0.01		0.06	0.01

a: p<0.05 as compared with <25 percebtile group, b: p<0.05 as compared with 25–50 percentile group, c: p<0.05 as compared with 50–75 percentile group.

N: number of subjects, Mean: adjusted mean, SE: standard error, p: p-value.

Confounders: parity (primipara or not), maternal age, weight, educational period (years), alcohol drinking during pregnancy (yes/no), family income, family smoking (yes/no), gestational weeks, infant age (days) on the day of each examination, and location difference (TK or ST hospital).

Note: Body size at 1 month was missing for 2 boys and 1 girl.