Table 1. Baseline characteristics of study subjects.
| Number of subjects | 11,586 | |
| Age, years, mean (SD) | 54 | (9.4) |
| Sex, n (%) | ||
| Male | 5,169 | (44.6) |
| Female | 6,417 | (55.4) |
| Smoking status, n (%) | ||
| Never smoker | 6,865 | (59.3) |
| Ever smoker | ||
| Former smoker | 2,331 | (20.1) |
| Current smoker | 2,382 | (20.6) |
| Unknown | 8 | (0.1) |
| Area, n (%) | ||
| Chiba | 845 | (7.3) |
| Aichi Cancer Center | 695 | (6.0) |
| Okazaki | 956 | (8.3) |
| Shizuoka+Daiko | 1,883 | (16.3) |
| Takashima | 457 | (3.9) |
| Kyoto | 958 | (8.3) |
| Fukuoka | 715 | (6.2) |
| Saga | 1,753 | (15.1) |
| Kagoshima | 1,085 | (9.4) |
| Tokushima | 641 | (5.5) |
| KOPS | 1,112 | (9.6) |
| Shizuoka/Sakuragaoka | 490 | (4.2) |
| Birth year, mean (SD) | 1,953 | (10.1) |
| BMI phenotype, kg/m2, mean (SD) | ||
| Current BMI | 23.1 | (3.3) |
| BMI at 20 | 20.9 | (2.4) |
| BMI change | 0.069 | (0.098) |
BMI, body mass index; KOPS, Kyusyu Okinawa Population Study; SD, standard deviation.