Table 3 The letters sorted according to the percentage of correct decisions made about the patient's sex.
Correct decision
interval (%)
Letter label
letters (%)
Patient's sex†
5.1 – 10.0 32* 1 (1.2) 2
10.1 – 15.0 59 1 (1.2) 2
25.1 – 30.0 4, 18, 25, 66 4 (4.9) 2, 2, 2, 2
30.1 – 35.0 44, 79, 36, 37, 4 (4.9) 1, 1, 1, 2
40.1 – 45.0 58, 55, 57 3 (3.7) 2, 1, 1
45.1 – 50.0 33, 81, 6, 23, 75, 2, 22, 74* 8 (9.9) 2, 2, 1, 1, 2, 1, 2, 1
50.1 – 55.0 45*, 50, 53, 54, 30, 39 6 (7.4) 2, 1, 2, 1, 2, 1
60.1 – 65.0 15, 29, 38, 48, 63, 5, 20, 46, 43, 62, 65, 73, 80 13 (16.0) 2, 2, 1, 2, 2, 2, 1, 2, 1, 1, 2, 2, 1
65.1 – 70.0 10, 14, 72, 56, 60, 69, 1, 11, 17, 35 10 (12.3) 2, 2, 1, 1, 1, 2, 1, 2, 1, 1
70.1 – 75.0 76, 7, 21, 52, 77, 31 6 (7.4) 1, 1, 1, 2, 1, 1
75.1 – 80.0 64, 78, 3, 9, 26, 41, 51 7 (8.6) 2, 1, 2, 1, 1, 2, 1
80.1 – 85.0 61, 71, 8, 40, 49 5 (6.2) 2, 2, 2, 1, 2
85.1 – 90.0 27, 12, 47, 67, 28, 42, 70 7 (8.6) 1, 1, 1, 1, 2, 1, 1
95.1 – 100 24* 1 (1.2) 2
Total 81 (100)
†1 = man, 2 = woman
*Letters further examined in the qualitative analysis.