Table 3.

Odds Ratios and 95% Confidence Intervals of 2-Level Logistic Regressions on Activities of Daily Living Difficulty and Self-rated Health of the Elderly, Chinese Longitudinal Health Longevity Survey, 2002^a

Community-Level Variables	Difficulty With Activities of Daily Living				Poor Self-rated Health
	Model 1		Model 2		Model 1		Model 2
	Odds Ratio	95% Confidence Interval	Odd Ratio	95% Confidence Interval	Odds Ratio	95% Confidence Interval	Odd Ratio	95% Confidence Interval
Air pollution index	1.25	1.15, 1.36***	1.01	0.79, 1.28	1.18	1.09, 1.28***	0.62	0.48, 0.80***
Medium gross domestic product per capita (low)b	1.18	0.89, 1.57	0.77	0.32, 1.83	0.82	0.62, 1.07	0.12	0.05, 0.28***
High gross domestic product per capita (low)b	1.55	1.17, 2.06**	0.50	0.21, 1.19	0.73	0.56, 0.96*	0.06	0.03, 0.14***
Air pollution index × medium gross domestic product per capita			1.15	0.89, 1.49			1.87	1.43, 2.43***
Air pollution index × high gross domestic product per capita			1.41	1.09, 1.83**			2.20	1.68, 2.86***

*P < 0.05; **P < 0.01; ***P < 0.001. All P values are 2 sided.

^aIn all the models, control variables include the average temperature in January for each city, age, gender, nationality, education, occupation, perceived economic condition, marital status, number of living children, smoking, drinking, exercise, and leisure activities.

^bThe category in parentheses is the reference category for a categorical variable.