Table 1.

Frequency Distribution of the Study Sample, Chinese Longitudinal Health Longevity Survey, 2002

	Total No.	% (Standard Deviation)	Mean (Standard Deviation)
Community-level factors
City districts	735
Air pollution index			3.5 (1.19)
Medium gross domestic product per capita		36.4 (0.48)
High gross domestic product per capita		52.7 (0.50)
Average temperature in January, °C			2.2 (7.4)
Individual-level factors
Respondents	7,358
Instrumental activities of daily living difficult, no.			14.2 (6.2)
Cognitive impaired, no.			7.7 (9.04)
Activities of daily living difficult		34.0 (0.47)
Self-rated poor health		22.4 (0.42)
Other individual-level factors
Age, years			86.3 (11.40)
Men		43.1 (0.50)
Non-Han ethnicity		4.2 (0.20)
1–6 years of schooling		30.3 (0.46)
≥7 years of schooling		16.4 (0.37)
White-collar job		14.8 (0.48)
Good family economic condition		20.5 (0.40)
Currently married		32.5 (0.47)
Living children, no.			3.1 (2.07)
Ever smoked in the past 5 years		21.7 (0.41)
Ever drank alcohol in the past 5 years		23.9 (0.43)
Ever did exercise in the past 5 years		44.2 (0.50)
Leisure activities index			2.3 (1.70)