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Table 2 Estimated incidence rate and incidence rate ratios of anaphylaxis from 2009–2019

From: Increasing incidence of anaphylaxis in Hong Kong from 2009 to 2019—discrepancies of anaphylaxis care between adult and paediatric patients

  2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Population of Hong Kong [10] 6,966,400 7,052,100 7,109,500 7,171,000 7,210,900 7,252,900 7,309,700 7,377,100 7,413,100 7,486,400 7,500,700
Aged 0–19 1,281,000
(18.4%)
1,257,600
(17.8%)
1,236,900
(17.4%)
1,220,100
(17.0%)
1,194,600
(16.6%)
1,183,300
(16.3%)
1,174,500 (16.1%) 1,167,600 (15.8%) 1,152,800 (15.5%) 1,155,900 (15.4%) 1,161,800 (15.4%)
Estimated incidence rates (per 100,000 population)
 Total incidence rate 2.27 2.44 2.15 2.19 2.80 4.44 4.47 4.35 4.59 4.69 4.68
Paediatric 2.11 2.54 1.70 1.64 2.68 5.07 4.94 4.20 5.99 6.32 7.40
Adult 2.30 2.42 2.25 2.30 2.83 4.32 4.38 4.38 4.33 4.39 4.18
Incidence rate ratiosa
 Total incidence rate ratio (95% confidence interval) Ref 1.07 (0.83, 1.28) 0.95 (0.78, 1.22) 0.96 (0.79, 1.23) 1.23 (0.89, 1.35) 1.96 (1.11, 1.62) 1.97 (1.11, 1.62) 1.92 (1.10, 1.60) 2.02 (1.12, 1.64) 2.07 (1.14, 1.65) 2.06 (1.13, 1.65)
Paediatric (95% confidence interval) Ref 1.20 (0.65, 1.81) 0.81 (0.51, 1.61) 0.78 (0.50, 1.60) 1.27 (0.66, 1.85) 2.40 (0.93, 2.30) 2.34 (0.92, 2.28) 1.99 (0.84, 2.16) 2.84 (1.01, 2.45) 3.00 (1.04, 2.50) 3.51 (1.12, 2.66)
Adult (95% confidence interval) Ref 1.05 (0.81, 1.30) 0.98 (0.78, 1.26) 1.00 (0.79, 1.27) 1.23 (0.87, 1.37) 1.88 (1.07, 1.62) 1.90 (1.07, 1.63) 1.90 (1.07, 1.63) 1.88 (1.07, 1.62) 1.91 (1.08, 1.63) 1.82 (1.05, 1.60)
  1. aIncidence rate ratios calculated using year 2009 as reference