Table 4.

Percentage change in K-SCQ scores associated with 2-fold increases in creatinine-adjusted prenatal BPA levels above or below 3.0 μg/g creatinine

		Below 3.0 μg/g creatinine		At or above 3.0 μg/g creatinine
Subcategory of K-SCQ score	Gender	% change (95% CI)	P-value	% change (95% CI)	P-value
Total	All	−0.1 (−4.8, 4.9)	0.9728	16.9 (2.3, 33.5)*	0.0214
	Boys	1.3 (−5.2, 8.2)	0.7062	10.8 (−6.1, 30.7)	0.2248
	Girls	−1.7 (−8.8, 6.0)	0.6624	29.4 (0.2, 67.1)*	0.0483
Social interaction	All	−1.6 (−11.6, 9.6)	0.7707	11.4 (−17.5, 50.4)	0.4817
	Boys	−6.4 (−18.2, 7.1)	0.3341	15.8 (−18.5, 64.7)	0.4127
	Girls	13.2 (−5.7, 35.8)	0.1842	−3.4 (−51.6, 92.5)	0.9210
Social communication	All	−1.3 (−9.5, 7.6)	0.7638	24.4 (−1.0, 56.4)#	0.0610
	Boys	7.0 (−5.6, 21.3)	0.2886	4.7 (−22.4, 41.3)	0.7644
	Girls	−9.0 (−20.0, 3.5)	0.1516	58.4 (6.5, 135.8)*	0.0233
Behavior patterns	All	2.2 (−7.3, 12.7)	0.6554	20.2 (−7.4, 55.9)	0.1667
	Boys	3.7 (−8.9, 18.1)	0.5796	16.3 (−15.0, 59.2)	0.3443
	Girls	−0.9 (−15.1, 15.7)	0.9080	29.3 (−24.5, 121.6)	0.3488

Models were adjusted for gender (boy or girl), parity (1st vs. other), mother’s education (high school or lower vs. more than high school), birth weight (kg), and use of plastic dishes in the microwave oven (yes or no). In addition, prenatal and postnatal BPA levels were mutually controlled for in the model

Abbreviations: K-SCQ Korean version of the Social Communication Questionnaire, BPA bisphenol A, CI confidence interval

^* P-value <0.05; ^# P-value <0.1