Table 2 Length of follow-up (person-time) and incidence rates by type of acute otitis media and age group
| Â | 0-1 year | 1-2 years | 2-3 years | 3-4 years | 4-5 years | 5-6 years | Total |
|---|---|---|---|---|---|---|---|
No. of children followed up | 69289 | 40106 | 41332 | 41683 | 41575 | 39921 | 92373 |
Person time (years) | 33241.9 | 37248.0 | 38950.5 | 39798.1 | 40151.6 | 37970.9 | 227361.0 |
Total AOM | Â | Â | Â | Â | Â | Â | Â |
No. of children | 3807 | 5673 | 5107 | 6991 | 5448 | 3935 | 21947 |
No. of episodes | 4709 | 7212 | 6180 | 8848 | 6664 | 4628 | 38241 |
Incidence rate* | 14.2 (13.8-14.6) | 19.4 (18.9-19.8) | 15.9 (15.5-16.3) | 22.2 (21.8-22.7) | 16.6 (16.2-17.0) | 12.2 (11.8-12.5) | 16.8 (16.7-17.0) |
Single AOM | Â | Â | Â | Â | Â | Â | Â |
No. of children | 3796 | 5576 | 5024 | 6915 | 5330 | 3855 | 21866 |
No. of episodes | 4550 | 6703 | 5858 | 8376 | 6285 | 4408 | 36180 |
Incidence rate* | 13.7 (13.3-14.1) | 18.0 (17.6-18.4) | 15.0 (14.7-15.4) | 21.0 (20.6-21.5) | 15.7 (15.3-16.0) | 11.6 (11.3-12.0) | 15.9 (15.7-16.1) |
Recurrent AOM | Â | Â | Â | Â | Â | Â | Â |
No. of children | 118 | 333 | 216 | 347 | 272 | 171 | 1173 |
No. of episodes | 159 | 509 | 322 | 472 | 379 | 220 | 2061 |
Incidence rate* | 0.5 (0.4-0.6) | 1.4 (1.3-1.5) | 0.8 (0.7-0.9) | 1.2 (1.1-1.3) | 0.9 (0.9-1.0) | 0.6 (0.5-0.7) | 0.9 (0.9-0.9) |