Table 4 Incidence rates of HAI during summer (June–August) compared with the rest of the year, 2013–2017
Comparison | IR (95% CI) | IRR (95% CI) | |
|---|---|---|---|
June–August (2013–2017) | Rest of the year (2013–2017) | IR (summer)/IR (the rest) | |
Overall | 3.82 (3.73, 3.92) | 3.71 (3.67, 3.77) | 1.03 (1.00, 1.06) |
Respiratory tract infection | 1.59 (1.53, 1.66) | 1.65 (1.62, 1.69) | 0.96 (0.92, 1.01) |
Bloodstream infection | 0.65 (0.61, 0.69) | 0.57 (0.55, 0.59) | 1.15 (1.07, 1.23) |
Urinary tract infection | 0.51 (0.48, 0.55) | 0.46 (0.44, 0.48) | 1.11 (1.02, 1.20) |
Surgery site infection | 0.33 (0.30, 0.36) | 0.32 (0.30, 0.34) | 1.03 (0.93, 1.14) |
Gastrointestinal infection | 0.30 (0.27, 0.33) | 0.27 (0.26, 0.29) | 1.11 (1 .00, 1.23) |
Stratified analyses by sex | |||
 Male | 4.27 (4.13, 4.40) | 4.05 (3.98,4.13) | 1.05 (1.01, 1.09) |
 Female | 3.24 (3.11, 3.38) | 3.26 (3.18, 3.34) | 0.99 (0.95, 1.04) |
Stratified analyses by age | |||
  ≤ 17 | 4.36 (4.01, 4.75) | 5.04 (4.79, 5.29) | 0.87 (0.79, 0.95) |
 18–44 | 3.02 (2.85, 3.19) | 2.92 (2.82, 3.02) | 1.03 (0.97, 1.10) |
 45–64 | 3.08 (2.95, 3.21) | 2.93 (2.86, 3.01) | 1.05 (1.00, 1.10) |
  ≥ 65 | 5.77 (5.54, 6.01) | 5.50 (5.36, 5.63) | 1.05 (1.00, 1.10) |