Overall crude mortality by follow-up times
| Follow-up time, yr | No. of deaths | Person-years | Mortality rate per 100 person-years (95% CI) |
|---|---|---|---|
| 0–1 | 2744 | 12 916 | 21 (20–22) |
| 1–2 | 1915 | 10 106 | 19 (18–20) |
| 2–3 | 1348 | 7586 | 18 (17–19) |
| 3–4 | 1065 | 5663 | 19 (18–20) |
| 4–5 | 817 | 4155 | 20 (18–21) |
| > 5 | 1668 | 8864 | 19 (18–20) |
| Total | 9557 | 49 289 | 19 (19–20) |
Note: CI = confidence interval.