Table 4.

Association of waist circumference with cognitive impairment under different body mass index groups

	Quartiles of body mass index, kg/m2
	12.1–20.8	>20.8–22.9	>22.9–25.3	>25.3–42.8
Subjects (n)	2244	2266	2311	2266
Model 1*	1.03 (1.01–1.05)	1.03 (1.01–1.05)	1.04 (1.02–1.06)	1.03 (1.01–1.04)
Model 2†	1.02 (1.001–1.04)	1.02 (0.995–1.03)	1.03 (1.01–1.05)	1.02 (1.01–1.04)
Model 3‡	1.01 (0.996–1.03)	1.01 (0.993–1.03)	1.02 (1.004–1.05)	1.02 (1.01–1.04)

*Adjusted for body mass index.

†Based on model 1, model 2 was further 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.