Table 1.

Individual characteristics of the respondents

		Mean	SD
BMI a (kg/m2)		22.9	3.2
		n	%
BMI (category)	Underweight: < 18.5	935	7.4
	Normal: 18.5-24.9	8757	69.5
	Overweight: 25-29.9	2625	20.8
	Obese: ≥30	278	2.2
Driving status	Non-driver	6246	49.6
	Driver	6349	50.4
Household composition	Living with someone	11449	90.9
	Living alone	1146	9.1
Gender	Male	5921	47.0
	Female	6674	53.0
Age	65-69	3909	31.0
	70-74	3773	30.0
	75-79	2710	21.5
	80-84	1504	11.9
	≥85	699	5.5
Marital status	Married	8905	70.7
	Unmarried	3128	24.8
	Missing	562	4.5
Educational attainment	< 10 years	7228	57.4
	10-12 years	3677	29.2
	≥13 years	1318	10.5
	Missing	372	3.0
Equivalized income	< 1.5 million yen	2529	20.1
	1.5-3.0 million yen	4434	35.2
	3.0-4.5 million yen	1738	13.8
	≥4.5 million yen	777	6.2
	Missing	3117	24.7
Drinking	No or moderate drinking	11693	92.8
	Heavy drinking	631	5.0
	Missing	271	2.2
Walking	30 minutes or more	8075	64.1
	Less than 30 minutes	3869	30.7
	Missing	651	5.2
SRH b	Good	7197	57.1
	Poor	2875	22.8
	Missing	2523	20.0
IADL c	High IADL	8882	70.5
	Low IADL	3185	25.3
	Missing	528	4.2
Diagnosed as cancer	No	12099	96.1
	Yes	405	3.2
	Missing	91	0.7
Diagnosed as heart disease	No	10855	86.2
	Yes	1649	13.1
	Missing	91	0.7
Diagnosed as stroke	No	12107	96.1
	Yes	397	3.2
	Missing	91	0.7

^a Body mass index

^b Self-rated health

^c Instrumental activities of daily living.