Table 2.

Association between body mass index and cognitive impairment

Quartiles of body mass index, kg/m2	OR (95% CI)
	Model 1* (n=9087)	Model 2† (n=9068)	Model 3‡ (n=9068)
12.1–20.8	1.42 (1.21 to 1.67)	1.20 (1.01 to 1.42)	1.18 (0.99 to 1.40)
>20.8–22.9	1	1	1
>22.9–25.3	0.92 (0.77 to 1.08)	1.02 (0.85 to 1.22)	1.02 (0.85 to 1.22)
>25.3–42.8	0.86 (0.72 to 1.02)	0.95 (0.79 to 1.14)	0.93 (0.77 to 1.12)

*No covariate was included.

†Adjusted for age, sex, nation, education, marital status and family economics.

‡Based on model 2, model 3 was further adjusted for smoking, drinking, physical exercise, hypertension, stroke and depression.