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Seropositivity in different age groups among school children in September 2009
| Age group (years) | No. sampled | HI titre ≥1:10 | HI titre ≥1:40 | ||
|---|---|---|---|---|---|
| No. | % (95% CI) | No. | % (95% CI) | ||
| < 5 | 149 | 12 | 8.1 (3.7-12.4) | 11 | 7.4 (3.2-11.6) |
| 5-9 | 821 | 203 | 24.7 (21.8-27.7) | 164 | 20.0 (17.2-22.7) |
| 10-14 | 1306 | 446 | 34.2 (31.6-36.7) | 350 | 26.7 (24.3-29.2) |
| 15-19 | 251 | 139 | 55.4 (49.2-61.5) | 106 | 42.2 (36.1-48.3) |
| Total | 2527 | 800 | 31.7 (29.8-33.5) | 631 | 25.0 (23.3-26.7) |
CI = confidence interval, HI = haemagglutination-inhibition
