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Table 4 Incidence rate and incidence rate ratio of COVID-19 diagnosis

From: Survival analysis and influence of the surgical aggression of a cohort of orthopedic and trauma patients in a non-controlled spread COVID-19 scenario

IR and IRR of COVID diagnosis by Group of Surgery
  person-time Failures IR (1000 person-day) Poisson-Exact (95% Conf. Interval) IRR Exact (95% CI)
Small Joints (soft tiss./arthros.) 2254 8 3.55 1.53 6.99 1 . .
Small Joints (bone or arthrop.) 2984 7 2.35 0.94 4.83 0.66 0.24 1.82
Big Joints (soft tiss./arthros.) 1031 0 0 0 3.58a 0   
Big Joints (bone or arthrop.) 3469 11 3.17 1.58 5.67 0.89 0.36 2.22
Total 9738 26 2.67 1.74 3.91    
  1. aOne-sided, 97.5% confidence interval for zero event
  2. IR Incidence rate, IRR Incidence rate ratio