Table 1.

Participant characteristics.

	N = 2141
	n (%)/mean (SD)
Sex (men)	1087	50.8%
Age, years	49.7	16.2
Marital status (married)	1216	56.8%
Working status (working)	1352	63.1%
Living arrangement (with others)	1695	79.2%
Smoking status (smokers)	318	14.9%
Past medical history (yes)
Hypertension	398	18.6%
Diabetes	125	5.8%
Respiratory disease	91	4.3%
Residential area (Tokyo)	824	38.5%
Educational attainment (University graduate or above)	1122	52.4%
Household income level (≥5 million yen)	1101	51.4%

SD: standard deviation.