Table 1 Questionnaire for investigation of lifestyles among the study subjects

1. Age

( ) years

2. Occupation

(1) Manufacturing etc.

(2) Official etc.

3. Education

(1) Middle school

(2) High school

(3) Technical college

(4) University or higher

4. Sports

(1) Almost everyday

(2) 2–4 times/week

(3) 1 time/week

(4) 1 time/month

(5) Almost none

5. Alcohol

(1) Almost everyday

(2) 3–5 times/week

(3) 1–2 times/week

(4) 1–3 times/month

(5) <1 time/month

6. Cigarette

(1) Smoker

(2) Former smoker

(3) Never smoked

7. Sleeping hours (h)

(1) ≥9

(2) 8

(3) 7

(4) 6

(5) ≤5 

8. Nutrition balance

(1) Pays attention

(2) Pays little attention

(3) Pays no attention

9. Breakfast

(1) Almost everyday

(2) Sometimes

(3) Rarely

10. Working hours (h)

(1) ≥11

(2) 10

(3) 9

(4) 8

(5) ≤7

11. Mental stress

(1) Much

(2) General

(3) Less