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| Age group | Population (%),n = 12,850 | Male sex,Frequency (%) | Follow-up duration, person-weeks(person-years) |
| ≤12 months | 2,528 (20) | 1,303 (52) | 54,894 (1,050) |
| <1 month | 194 (2) | 101 (52) | 4,213 (81) |
| 1–2 months | 338 (3) | 167 (49) | 7,339 (140) |
| 3–6 months | 851 (7) | 435 (51) | 18,479 (353) |
| 7–12 months | 1145 (9) | 600 (52) | 24,863 (476) |
| 12–59 months | 10, 322 (80) | 5,284 (51%) | 224,135 (4,287) |
