Table 2.
Variation in oral anticoagulant propensity between general practice clinics
Observed variation (p90/p10)
Random variation (p90/p10)
Excess variation (observed/random)
1.08/0.90 = 1.20
1.07/0.92 = 1.16
1.20/1.16 = 1.03
p10 = 10
th
percentile. p90 = 90
th
percentile