Table 2.

Cox proportional hazards model of the clinical determinants of PSCI

	Model 1a		Model 2b
	RR (95% CI)	P-value	RR (95% CI)	P-value
Vitamin D levels
Vitamin D deficiency (<25 nmol/L)	2.243 (1.442–3.448)	<0.001	2.124 (1.307–3.449)	0.002
Vitamin D insufficiency (25–50 nmol/L)	1.080 (0.692–1.686)	0.734	1.096 (0.687–1.747)	0.701
Vitamin D sufficiency (>50 nmol/L)	Reference		Reference
Age, years	1.029 (1.004–1.050)	0.004	1.018 (0.997–1.040)	0.099
Gender, female	2.153 (1.487–3.116)	<0.001	1.535 (0.962–2.449)	0.076
Years of education	0.903 (0.855–0.953)	<0.001	0.940 (0.884–0.999)	0.047
Current smoking	0.533 (0.329–0.864)	0.011	0.750 (0.431–1.304)	0.308

Notes:

^aModel 1: unadjusted.

^bModel 2: adjusted for age, gender, years of education, hypertension, diabetes mellitus, coronary artery disease, current smoking, and lesion location.

Abbreviations: CI, confidence interval; PSCI, poststroke cognitive impairment; RR, risk ratio.