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Table 2 Probability that performance in the 'column clinic' is worse than in the 'row clinic'.

From: Incorporating natural variation into IVF clinic league tables: The Expected Rank

Clinics A B C D E F G H I J K L M
A - 64% 78% 83% 89% 88% 93% 98% 100% 99% 100% 100% 100%
B 36% - 65% 73% 81% 81% 86% 95% 99% 98% 100% 100% 100%
C 22% 35% - 61% 70% 71% 77% 91% 98% 96% 100% 100% 100%
D 17% 27% 39% - 69% 61% 67% 84% 95% 92% 100% 100% 100%
E 11% 19% 30% 41% - 54% 58% 79% 93% 90% 100% 100% 100%
F 12% 19% 29% 39% 46% - 54% 74% 89% 86% 99% 100% 100%
G 7% 14% 23% 33% 42% 46% - 72% 9% 86% 99% 100% 100%
H 2% 5% 9% 16% 21% 26% 28% - 73% 71% 95% 99% 100%
I 0% 1% 2% 5% 7% 11% 10% 27% - 52% 88% 98% 99%
J 1% 2% 4% 8% 10% 14% 14% 29% 48% - 81% 95% 98%
K 0% 0% 0% 0% 0% 0% 1% 5% 12% 19% - 83% 93%
L 0% 0% 0% 0% 0% 0% 0% 1% 2% 5% 17% - 73%
M 0% 0% 0% 0% 0% 0% 0% 0% 1% 2% 7% 27% -
  1. E.g. there is a 36% probability that an average couple at clinic A has a lower chance of pregnancy than if they attend clinic B.