Table 6. Comparisons of Bayley III scores after adjusting for confounders among 4 dioxin groups.

Percentile of PCDDs/Fs-TEQ (pg/gfat)				<25		25–50				50–75					≥75
Gender	Domain			Mean	SE	Mean	SE	p		Mean		SE	p		Mean	SE	p
Boys	N			30		37				28					25
	Cognitive	Total	cs	93.0	2.3	95.2	2.0		95.1		2.3			87.2		2.6	b,c
	Language	Total	cs	96.1	1.2	98.4	1.0		96.7		1.2			94.0		1.3	b
		Reseptive com	ss	8.4	0.3	9.1	0.2	a	8.5		0.3			8.4		0.3
		Expressive com	ss	10.2	0.2	10.3	0.2		10.3		0.2			9.5		0.2	a,b,c
	Motor	Total	cs	101.1	2.0	102.4	1.7		101.1		2.0			96.9		2.2
		Fine motor	ss	8.8	0.3	9.3	0.3		8.6		0.3			7.9		0.4	b
		Gross motor	ss	11.4	0.5	11.4	0.4		11.7		0.5			11.0		0.5
Girls	N			22		15			24					28
	Cognitive	Total	cs	95.0	3.0	100.2	3.3		93.8		2.6			91.1		2.5	b
	Language	Total	cs	98.3	1.7	97.0	1.8		95.7		1.4			95.3		1.4
		Reseptive com	ss	8.9	0.4	8.5	0.4		8.4		0.3			8.4		0.3
		Expressive com	ss	10.5	0.3	10.5	0.3		10.2		0.3			10.0		0.3
	Motor	Total	cs	105.0	2.6	106.6	2.8		101.6		2.3			101.6		2.2
		Fine motor	ss	9.9	0.5	10.2	0.5		9.2		0.4			9.0		0.4
		Gross motor	ss	11.7	0.5	11.9	0.5		11.2		0.4			11.5		0.4

a: p<0.05 as compared with <25 percentile 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.

cs: composite score, ss: scale score, com: communication.

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: Bayley III test could not be performed for 1 girl.