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Table 3 Measures of diagnostic accuracya for repeat self-harm with 95% confidence intervals, N = 4000, m (missing data imputation) =1–5

From: Accuracy of risk scales for predicting repeat self-harm and suicide: a multicentre, population-level cohort study using routine clinical data

Scale

Thresholds

Sens %

Spec %

PPV %

NPV %

LR+

LR-

DOR

MSHR

Low risk (0) vs. moderate/high risk (1+)

98 (97, 99)

15 (14, 17)

31 (30, 33)

95 (93, 97)

1.155 (1.154, 1.156)

0.13 (0.12, 0.15)

8.6 (5.6, 13.2)

ReACT

Low risk (0) vs. moderate/high risk (1+)

94 (93, 96)

23 (22, 25)

33 (31, 34)

91 (89, 93)

1.23 (1.228, 1.231)

0.240 (0.230, 0.250)

5.1 (3.9, 6.7)

SPS

Low risk (0–4) vs. moderate risk (5–6)

24 (22, 27)

76 (74, 78)

28 (25, 31)

72 (71, 74)

1.01 (0.98, 1.04)

0.996 (0.993, 0.999

1.0 (0.9, 1.2)

Moderate risk (5–6) vs. high risk (7–10)

29 (24, 34)

77 (74, 79)

34 (29, 40)

72 (69, 75)

1.23 (1.16, 1.30)

0.931 (0.923, 0.939)

1.3 (1.0, 1.7)

MSPS

Low risk (0–5) vs. moderate risk (6–8)

9 (7, 11)

90 (89, 91)

26 (22, 31)

72 (70, 73)

0.9 (0.7, 1.1)

1.01 (1.008, 1.012)

0.9 (0.7, 1.1)

Moderate risk (6–8) vs. high risk (> 8)

12 (7, 20)

90 (86, 93)

32 (19, 48)

74 (69, 78)

1.3 (0.4, 3.6)

0.97 (0.95, 0.99)

1.3 (0.7, 2.6)

  1. aSens sensitivity, Spec specificity, PPV positive predictive value, NPV negative predictive value, LR+ positive likelihood ratio, LR- negative likelihood ratio, DOR diagnostic odds ratio