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Table 4 Incidence rates of HAI during summer (June–August) compared with the rest of the year, 2013–2017

From: Incidence of healthcare-associated infections in a tertiary hospital in Beijing, China: results from a real-time surveillance system

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)
  1. IR incidence rate. IRR incidence rate ratio. CI confidence interval