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Table 1 Sex-adjusted appendectomy rates per 100,000 children in the population less than nineteen years of age by district health council (DHC) of patient residence in Ontario, fiscal 1993-2000

From: Does access to care affect outcomes of appendicitis in children? - a population-based cohort study

District Health Council (DHC) Percent Rural Positive Appendectomy Negative Appendectomy Perforated Appendicitis
   Number of Appendectomy Per Year † Sex- Adjusted Rate ‡ Number of Appendectomy Per Year † Sex- Adjusted Rate ‡ Number of Appendectomy Per Year † Sex- Adjusted Rate ‡
sorted by ascending rank order of rural to urban)        
Grey, Bruce, Huron, Perth 82 84.4 102.2 14.3 17.1 30.3 36.9
Muskoka, Nipissing, Parry Sound & Timiskaming 74 70.4 122.6* 15.0 26.0*** 23.3 40.8
Quinte, Kingston, Rideau 39 133.0 107.8 15.6 12.3 15.6 29.5
Algoma, Cochrane, Manitoulin & Sudbury 37 115.9 98.4 16.1 13.6 36.9 31.8
Grand River 32 75.9 115.4 12.4 18.7 24.5 37.5
Northwestern Ontario 29 80.3 112.0 12.3 17.1 27.3 38.2
Waterloo Region-Wellington-Dufferin 23 186.8 106.0 32.4 18.4 65.8 37.3
Thames Valley 23 142.6 91.9 22.0 14.2 50.4 32.5
Essex, Kent, and Lambton 20 142.5 87.3 15.0 9.1 39.5 24.4
Durham, Haliburton, Kawartha & Pine Ridge 19 236.9 110.5** 47.1 22.2*** 76.4 35.7
Champlain 16 262.0 100.5 24.8 9.5 78.6 30.1
Simcoe-York 9 243.6 88.3 32.4 11.7 93.4 33.7
Niagara Region 3 77.5 74.5* 12.8 12.3 24.4 23.6
Halton-Peel 0 283.3 83.2 38.0 11.1 95.6 28.0
Hamilton-Wentworth 0 96.6 80.4 8.3 6.8 38.0 31.6
Metropolitan Toronto 0 427.5 81.4** 59.1 11.3 152.0 28.9
Province-wide Age and Sex Adjusted Rate    93.20   13.19   31.29
SMALL AREA VARIATION SUMMARY STATISTICS       
Extremal Quotient [EQ]    1.65   3.80   1.73
Ratio of Third Quartile over First Quartile    1.28   1.59   1.27
Coefficient of Variation    13.09   32.04   12.95
Systematic Component of Variation    15.63   87.74   -0.10
  1. † Average over time period
  2. ‡ Rate per 100,000
  3. * p < 0.05; ** p < 0.01; *** p < 0.001
  4. The p-values are based on the 1 degree of freedom chi-square test for the difference in appendectomy rates between each DHC and the province-wide rate.