Table 4
Diagnostic accuracy according to the number of risk factors
Risk factors
Sens (%)
Spec (%)
Acc (%)
0
75 (3/4)
78 (7/9)
77 (10/13)
1
89 (16/18)
84 (37/44)
85 (53/62)
2
86 (31/36)
81 (54/67)
83 (85/103)
3
87 (19/21)
72 (35/53)
72 (55/76)
⩾4
83 (20/24)
71 (22/31)
76 (42/55)