Table 1 Distribution by age in 1968 versus vital status in 2017 of Japanese Yusho patients
|  | Males (n = 860) | Females (n = 804) |
|---|---|---|
No. (%) | No. (%) | |
Age in 1968 | ||
 < 20 | 345 (40.1) | 305 (37.9) |
 20–29 | 94 (10.9) | 99 (12.3) |
 30–39 | 126 (14.7) | 136 (16.9) |
 40–49 | 140 (16.3) | 130 (16.2) |
 50–59 | 82 (9.5) | 68 (8.5) |
 60–69 | 49 (5.7) | 43 (5.3) |
 70–79 | 20 (2.3) | 21 (2.6) |
 > 80 | 4 (0.5) | 2 (0.2) |
Vital status of 31 December 2017 | ||
 Alive | 500 (58.1) | 521 (64.8) |
 Dead | 360 (41.9) | 283 (35.2) |
 Person-years of follow-up | 31,559 | 32,007 |