Table 3.

Characteristics of study participants in the BioBank Japan Study.

	Male		Female
	N	%	N	%
Sex	106,093	53.1	93,696	46.9
Age group at entry (years)
<20	1413	1.3	982	1.0
20–29	2062	1.9	2842	3.0
30–39	4815	4.5	6534	7.0
40–49	8302	7.8	9483	10.1
50–59	19,515	18.4	16,410	17.5
60–69	31,637	29.8	23,796	25.4
70–79	30,065	28.3	24,106	25.7
≥80	8272	7.8	9522	10.2
Unknown	12	0.0	21	0.0
BMIa (kg/m2)
Lean (BMI < 18.5)	5653	5.4	8525	9.2
Normal (18.5 ≤ BMI < 25)	63,137	60.3	55,330	59.7
Overweight (25 ≤ BMI < 30)	24,865	23.8	17,826	19.2
Obese (30 ≤ BMI)	3898	3.7	4202	4.5
Unknown	7115	6.8	6810	7.3
Smoking statusa
Never smoker	25,690	24.5	71,637	77.3
Ex-smoker	44,919	42.9	8521	9.2
Current smoker	28,524	27.3	9505	10.3
Smoker, unknown current status	3547	3.4	1293	1.4
Unknown if ever smoked	1988	1.9	1737	1.9
Alcohol intakea
Never drinker	30,933	29.6	64,987	70.1
Ex-drinker	13,618	13.0	3614	3.9
Current drinker (0–10 g/day)	14,610	14.0	11,818	12.7
Current drinker (10–20 g/day)	10,296	9.8	3801	4.1
Current drinker (20–60 g/day)	20,884	20.0	3251	3.5
Current drinker (60 + g/day)	7496	7.2	765	0.8
Drinker, unknown current status	4175	4.0	2277	2.5
Unknown	2656	2.5	2180	2.4
Hypertension
Normotension	37,898	35.7	40,692	43.4
Hypertension	53,962	50.9	38,127	40.7
Unknown	14,233	13.4	14,877	15.9
Physical exercise
Three or more times a week	21,558	20.3	20,159	21.5
Once or twice a week	3692	3.5	6132	6.5
No habit	68,367	64.4	56,796	60.6
Unknown	12,476	11.8	10,609	11.3

Because the sex was unknown, 193 participants were excluded from this analysis.

Abbreviation: BMI, body mass index.

^aPeople of unknown age or under the age of 20 were excluded.