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Table 2 Length of follow-up (person-time) and incidence rates by type of acute otitis media and age group

From: Burden of acute otitis media in primary care pediatrics in Italy: a secondary data analysis from the Pedianet database

  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        
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        
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        
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)
  1. * Incidence rate (per 100 PY, 95% CI).