Baseline characteristics of study participants in each cohort
| All | JPHC1 | JPHC2 | JACC | TPCS | ||||||
| (1990–2000) | (1993–2003) | (1988/90–1999) | (1983/85–1993/95) (1990–2000) | |||||||
| Male | Female | Male | Female | Male | Female | Male | Female | Male | Female | |
| No of participants | 140026 | 156810 | 23478 | 26561 | 29567 | 33175 | 42528 | 53370 | 44453 | 43704 |
| Average age at entry (SD) | 54.1 (9.7) | 54.5 (9.8) | 49.0 (6.0) | 49.0 (5.9) | 53.2 (8.8) | 53.5 (8.9) | 57.3 (10.2) | 57.3 (10.1) | 54.4 (10.2) | 55.2 (10.5) |
| Average person year (SD) | 9.5 (2.5) | 9.8 (2.1) | 10.3 (1.8) | 10.5 (1.5) | 10.0 (2.0) | 10.4 (1.5) | 9.7 (2.4) | 10.0 (2.1) | 8.4 (2.8) | 8.6 (2.6) |
| Smoking status (%) | ||||||||||
| Current smoker | 54.4 | 8.1 | 53.6 | 7.9 | 52.0 | 7.3 | 53.0 | 5.6 | 57.8 | 11.9 |
| Former smoker | 25.0 | 2.4 | 23.1 | 2.5 | 24.5 | 1.5 | 26.4 | 1.7 | 25.1 | 3.7 |
| Never smoker | 20.5 | 89.5 | 23.3 | 90.7 | 23.5 | 91.2 | 20.5 | 92.6 | 17.1 | 84.4 |