Table 5 Cumulative incidence and incidence rate (in 1000 person year) stratified by gender and age groups
Age Group | 7–9 years old (N = 559) | 10–11 years old (N = 474) | ||||
|---|---|---|---|---|---|---|
Boys | Girls | Total | Boys | Girls | Total | |
Cumulative incidence | 26.4 (20.2–34.1) | 17.6 (12.5–24.5) | 22.0 (17.8–27) | 10.8 (6.4–17.9) | 10.7 (6.5–17.4) | 10.8 (7.5–15.3) |
Incidence rate (in 1000 person year) | 20.4 (15.0–27.7) | 12,0 (8.2–17.3) | 15.9 (12.5–20.1) | 7.3 (4.2–12.6) | 7.0 (4.1–11.8) | 7.1 (4.9–10.4) |