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Table 2 Age-adjusted Incidence Rate Ratios (IRR) with 95% Confidence Intervals (CI) for tonsillectomy and/or adenoidectomy (A/T) among children aged 2–9 years.

From: Variability of adenoidectomy/tonsillectomy rates among children of the Veneto Region, Italy

  IRR (95% CI)
Males vs females 1.29 (1.25–1.33)
Non-Italian vs Italian children 0.57 (0.53–0.61)
A/T rates (×1000) in each LHU, age class 10–40 yrs 1.51 (1.22–1.86)
  1. LHU-level variance = 0.048.
  2. Random-intercept Poisson regression; clustering variable = Local Health Unit (LHU).