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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.