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Table 2 Incidence of acute respiratory (ARI) and gastrointestinal (AGI) infections, by mode of data collection and age group

From: Incidence and comparison of retrospective and prospective data on respiratory and gastrointestinal infections in German households

  Prospective data collection Retrospective data collection Significance (p-value for differences between the study arms
  Person days Episodes Incidence per person month (30 days)c Incidence per person year (365 days) Person days Episodes Incidence per person month (30 days)c Incidence per person year (365 days) α = 0.05
ARI Age groups
 0–3 years 7009 164 0.7 (0.59; 0.82) 8.54 8311 217 0.78 (0.68; 0.89) 9.49 p = 0.31
 4–6 years 5729 100 0.52 (0.43; 0.64) 6.37 5882 103 0.53 (0.43; 0.64) 6.39 p = 1.00
 7–15 years 1891 13 0.21 (0.12; 0.33) 2.51 2828 41 0.43 (0.31; 0.59) 5.29 p = 0.02
  > 15 years 17,274 229 0.4 (0.35; 0.45) 4.84 22,970 330 0.43 (0.39; 0.48) 5.22 p = 0.37
 Total 32387a 507 0.47 (0.42; 0.52) 5.71 40050b 691 0.52 (0.48; 0.56) 6.32 p = 0.10
AGI Age groups
 0–3 years 7117 48 0.2 (0.16; 0.26) 2.46 8120 53 0.2 (0.15; 0.26) 2.37 p = 0.95
 4–6 years 5792 24 0.12 (0.08; 0.18) 1.51 5721 30 0.16 (0.11; 0.22) 1.91 p = 0.47
 7–15 years 1902 6 0.09 (0.04; 0.20) 1.15 2724 17 0.19 (0.11; 0.30) 2.28 p = 0.21
  > 15 years 17,441 66 0.11 (0.09; 0.15) 1.38 22,370 83 0.11 (0.09; 0.14) 1.35 p = 0.97
 Total 32736a 144 0.13 (0.11; 0.16) 1.61 38994b 183 0.14 (0.12; 0.16) 1.7 p = 0.60
  1. aMissing information on age for 4 persons (contributing 484 person days), bMissing information on age for 1 person (contributing 59 person days), cConfidence Intervals (CI’s) in brackets