Table 4. The multivariate linear regression analysis for risk factors on FSIQ < 85.

Variables	VCIQ			VSIQ			WMIQ			FSIQ
	Adjusted OR	95% CI	P valuea	Adjusted OR	95% CI	P valuea	Adjusted OR	95% CI	P valuea	Adjusted OR	95% CI	P valuea
GA	1.090	0.876–1.357	0.439	1.123	0.892–1.414	0.322	1.001	0.772–1.297	0.996	1.210	0.901–1.624	0.205
Sex	1.720	0.557–5.314	0.346	0.797	0.237–2.681	0.714	0.349	0.081–1.495	0.156	0.646	0.152–2.741	0.554
IUGR	11.898	2.543–55.674	0.002	3.212	0.713–14.460	0.129	2.263	0.403–12.708	0.354	6.611	1.265–34.557	0.025
IVH (III–IV)	3.352	0.570–19.721	0.181	1.773	0.289–10.898	0.536	8.607	1.595–46.452	0.012	1.614	0.703–3.706	0.259
Maternal education	1.100	0.330–3.667	0.876	0.814	0.217–3.050	0.760	1.092	0.234–5.095	0.911	2.068	0.366–11.676	0.411

OR = odds ratio, CI = confidence interval, GA = gestational age, VCIQ = vocabulary comprehension intelligence quotient, VSIQ = visual spatial intelligence quotient, WMIQ = working memory intelligence quotient, FSIQ = full scale intelligence quotient, IUGR = intrauterine growth retardation, IVH = intraventricular hemorrhage.

^aControlling for GA, sex, IVH, and maternal education.