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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