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## Need to compare incidence between two groups.

So, I have this big table. I am only interested in looking at incidence of infection (number of infections / total days of admission per age group ) and determining if there was a difference between the pre and post intervention group. What analysis should I be using.

The second table attached is the simplified version: (Total number of infections, total admissions days and Incidence of infection per 100 days of admission) distributed per age group.

Any suggestion/ help is much appreciated.

 Admission days Age group number of infections Intervention group 2 a 0 Post 31 a 1 Post 5 a 0 Post 31 a 1 Post 5 a 0 Post 30 a 0 Post 29 a 1 Post 2 a 0 Post 30 a 0 Post 5 a 0 Post 4 a 0 Post 3 a 0 Post 3 a 0 Post 10 a 0 Post 9 a 0 Post 13 a 1 Post 2 a 0 Post 2 a 0 Post 2 a 0 Post 11 a 0 Post 12 a 0 Post 4 a 0 Post 5 a 1 Post 22 a 0 Post 7 a 0 Post 13 a 1 Post 5 a 0 Post 2 a 0 Post 2 a 0 Post 12 a 0 Post 4 a 0 Post 3 a 0 Post 2 a 0 Post 7 a 0 Post 4 a 0 Post 5 a 0 Post 2 a 0 Post 13 a 1 Post 5 a 0 Post 3 a 0 Post 7 a 0 Post 4 a 0 Post 2 a 0 Post 3 a 0 Post 4 a 0 Post 3 a 0 Post 3 a 0 Post 3 a 0 Post 5 a 0 Post 11 b 0 Post 3 b 0 Post 8 b 0 Post 3 b 0 Post 4 b 0 Post 3 b 0 Post 3 b 0 Post 7 b 0 Post 3 b 0 Post 4 b 0 Post 2 b 0 Post 3 b 0 Post 3 b 0 Post 2 b 0 Post 4 b 0 Post 6 b 0 Post 4 b 0 Post 4 b 0 Post 6 b 0 Post 4 b 0 Post 3 b 0 Post 4 b 0 Post 5 b 0 Post 7 b 0 Post 2 b 0 Post 7 b 0 Post 3 b 0 Post 4 b 0 Post 3 b 0 Post 4 b 0 Post 2 b 0 Post 5 b 0 Post 15 b 0 Post 4 b 0 Post 9 b 0 Post 4 c 0 Post 4 c 0 Post 2 c 0 Post 4 c 0 Post 3 c 0 Post 3 c 0 Post 4 c 0 Post 5 c 0 Post 3 c 0 Post 3 c 0 Post 5 c 0 Post 35 c 0 Post 7 c 0 Post 12 c 0 Post 8 c 1 Post 48 c 0 Post 20 c 0 Post 3 c 0 Post 2 c 0 Post 3 d 0 Post 5 d 0 Post 2 d 0 Post 3 d 0 Post 4 d 0 Post 4 d 0 Post 12 d 0 Post 2 d 0 Post 5 d 0 Post 3 d 0 Post 11 d 0 Post 5 d 0 Post 4 d 0 Post 2 d 0 Post 21 d 0 Post 3 d 0 Post 3 d 0 Post 5 d 0 Post 3 d 0 Post 6 d 0 Post 4 d 0 Post 3 d 0 Post 5 d 0 Post 14 d 1 Post 3 d 0 Post 3 d 0 Post 2 d 0 Post 3 d 0 Post 2 d 0 Post 5 d 0 Post 3 d 0 Post 5 d 0 Post 6 d 0 Post 4 d 0 Post 2 d 0 Post 5 d 0 Post 2 d 0 Post 34 d 1 Post 6 a 0 Pre 34 a 0 Pre 31 a 0 Pre 17 a 1 Pre 28 a 0 Pre 16 a 1 Pre 4 a 1 Pre 5 a 0 Pre 6 a 0 Pre 2 a 0 Pre 6 a 0 Pre 2 a 0 Pre 16 a 1 Pre 5 a 0 Pre 12 a 0 Pre 2 a 0 Pre 6 a 0 Pre 2 a 0 Pre 9 a 0 Pre 4 a 0 Pre 2 a 0 Pre 6 a 0 Pre 2 a 0 Pre 3 a 0 Pre 4 a 0 Pre 2 a 0 Pre 5 a 0 Pre 5 a 0 Pre 3 a 0 Pre 2 a 0 Pre 4 a 0 Pre 6 a 0 Pre 4 a 0 Pre 2 a 0 Pre 4 a 0 Pre 2 a 0 Pre 3 a 0 Pre 5 a 0 Pre 5 a 0 Pre 35 a 1 Pre 8 a 0 Pre 29 a 1 Pre 8 a 0 Pre 12 a 0 Pre 4 a 0 Pre 5 a 0 Pre 9 a 0 Pre 4 a 0 Pre 2 a 0 Pre 5 a 0 Pre 6 a 0 Pre 3 a 0 Pre 5 a 0 Pre 5 a 0 Pre 3 a 0 Pre 3 a 0 Pre 2 a 0 Pre 4 a 0 Pre 15 a 0 Pre 4 a 0 Pre 4 a 0 Pre 5 b 0 Pre 14 b 1 Pre 10 b 1 Pre 5 b 0 Pre 2 b 0 Pre 5 b 0 Pre 8 b 0 Pre 5 b 0 Pre 3 b 0 Pre 2 b 0 Pre 4 b 0 Pre 4 b 0 Pre 3 b 0 Pre 5 b 0 Pre 4 b 0 Pre 4 b 0 Pre 4 b 0 Pre 4 b 0 Pre 8 b 0 Pre 3 b 0 Pre 3 b 0 Pre 4 b 0 Pre 9 b 0 Pre 4 b 0 Pre 3 b 0 Pre 5 b 0 Pre 4 b 0 Pre 5 c 0 Pre 3 c 0 Pre 4 c 0 Pre 2 c 0 Pre 4 c 0 Pre 2 c 0 Pre 3 c 0 Pre 5 c 0 Pre 4 c 1 Pre 4 c 0 Pre 3 c 0 Pre 3 c 0 Pre 15 c 1 Pre 29 c 2 Pre 5 c 0 Pre 19 c 1 Pre 4 c 0 Pre 5 c 0 Pre 3 c 0 Pre 4 c 0 Pre 6 c 0 Pre 4 c 0 Pre 4 c 0 Pre 3 c 0 Pre 3 c 0 Pre 3 c 0 Pre 2 c 0 Pre 2 c 0 Pre 9 c 0 Pre 4 c 0 Pre 11 c 1 Pre 2 c 0 Pre 5 c 0 Pre 2 c 0 Pre 3 c 0 Pre 3 c 0 Pre 3 c 0 Pre 2 c 0 Pre 2 c 0 Pre 4 c 0 Pre 3 c 0 Pre 4 c 0 Pre 3 c 0 Pre 4 c 0 Pre 3 c 0 Pre 3 c 0 Pre 3 c 0 Pre 3 c 0 Pre 5 d 0 Pre 7 d 1 Pre 4 d 0 Pre 4 d 0 Pre 4 d 0 Pre 7 d 1 Pre 3 d 0 Pre 8 d 1 Pre 2 d 0 Pre 2 d 0 Pre 3 d 0 Pre 3 d 0 Pre 5 d 0 Pre 3 d 0 Pre 3 d 0 Pre 2 d 0 Pre 3 d 0 Pre 4 d 0 Pre 6 d 0 Pre 5 d 0 Pre 15 d 1 Pre 4 d 0 Pre 4 d 0 Pre 4 d 1 Pre 6 d 0 Pre 3 d 0 Pre 5 d 0 Pre 8 d 0 Pre 3 d 0 Pre 3 d 0 Pre 7 d 0 Pre 5 d 0 Pre 2 d 0 Pre 3 d 0 Pre 3 d 0 Pre 4 d 0 Pre 5 d 0 Pre 4 d 0 Pre 2 d 0 Pre 23 d 0 Pre 7 d 0 Pre 4 d 0 Pre 5 d 0 Pre 3 d 0 Pre 2 d 0 Pre 2 d 0 Pre 18 d 3 Pre 18 d 1 Pre 7 d 0 Pre 6 d 0 Pre 5 d 0 Pre 2 d 0 Pre 4 d 0 Pre

 Number of Infections Admission days Group Age group ID (infection/100 admission days) 6 457 Pre a 1.3129 2 134 Pre b 1.4925 6 229 Pre c 2.6201 9 279 Pre d 3.2258 7 395 Post a 1.7721 0 164 Post b 0.0000 1 175 Post c 0.5714 2 211 Post d 0.0095