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Table 3 Number of cases, rates by 10,000 inhabitants and observed statistics of variation in procedures of low and high variability

From: Is there much variation in variation? Revisiting statistics of small area variation in health services research

A: Low variability
  Pacemaker Appendectomy Hip Fracture
  Estimate CI Estimate CI Estimate CI
y i 11973   28164   33851  
Rate 3.77   8.90   10.57  
EQ NC -- 20.61 3.20; 20.61 4.11 3.28; 4.11
EQ 5–95 3.15 2.49; 3.58 2.49 2.20; 2.74 2.37 2.00; 2.69
CV 0.38 0.33; 0.43 0.30 0.25; 0.34 0.26 0.24; 0.29
CV 5–95 0.27 0.24; 0.31 0.22 0.19; 0.25 0.21 0.19; 0.24
CVw 0.33 0.28; 0.38 0.30 0.25; 0.34 0.27 0.23; 0.31
CVw 5–95 0.26 0.23; 0.31 0.24 0.19; 0.26 0.21 0.19; 0.24
SCV 0.12 0.08; 0.16 0.11 0.08; 0.16 0.07 0.06; 0.08
SCV 5–95 0.05 0.04; 0.08 0.06 0.04; 0.08 0.04 0.03; 0.06
EB 0.13 0.08; 0.20 0.08 0.06; 0.10 0.07 0.05; 0.09
χ 2 1306.85 964.45;1711,39 2330.55 1710.91;3098.22 2394.66 1820.36;3017.15
Bohning 68.46 47.88; 92.28 136.98 93.89; 187.56 131.32 96.41; 167.70
Dean 67.44 40.11; 107.10 164.03 97.40; 246.83 132.92 80.47; 203.67
B: Low variability
  Lower Ext. Amput. Hernia Repair Knee replacement
  Estimate CI Estimate CI Estimate CI
y i 7022   21101   23257  
Rate 2.23   6.67   7.39  
EQ 25.59 7.04; 25.59 NC -- 29.13 12.09; 29.14
EQ 5–95 4.11 3.54; 5.10 4.06 3.28; 4.90 5.61 4.39; 8.66
CV 0.42 0.36; 0.47 0.41 0.37; 0.45 0.49 0.44; 0.55
CV 5–95 0.33 0.27; 0.37 0.34 0.29; 0.37 0.39 0.33; 0.44
CVw 0.40 0.34; 0.46 0.41 0.35; 0.47 0.48 0.41; 0.54
CVw 5–95 0.31 0.27; 0.38 0.34 0.29; 0.38 0.39 0.32; 0.45
SCV 0.20 0.14; 0.28 0.17 0.13; 0.21 0.25 0.18; 0.32
SCV 5–95 0.13 0.07; 0.20 0.11 0.08; 0.13 0.14 0.10; 0.19
EB 0.17 0.12; 0.24 0.17 0.13; 0.22 0.27 0.19; 0.35
χ 2 1171.47 850.08;1534.95 3531.00 2723.57;4438.64 5164.25 3766.17;6898.34
Bohning 59.35 41.85; 78.83 195.84 146.27; 247.92 289.92 207.33; 384.14
Dean 54.57 32.13; 89.46 222.09 149.79; 314.23 275.13 170.29; 424.52
  1. CI: Confidence interval; EQ: extremal quotient; CV: Coefficient of variation; CVw: weighted coefficient of variation; SCV: Systematic Component of Variance; EB: Empirical Bayes; Statistic with the subindex 5–95 have been estimated excluding the 5% of areas with rates under percentile 5 and over percentile 95 for each procedure; NC: Not Calculable.