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Table 5 Sensitivity and specificity analysis of the SIQ, SIQ-JR, and SIQ-JR-4

From: Validation of the Chinese version of the Reynolds’ suicidal ideation questionnaire: psychometric properties and its short version

  SIQ (cutoff = 13)a SIQ-JR (cutoff = 6)a, b SIQ-JR-4 (cutoff = 1)a
Predicting suicidal ideation in the past 12 months (44 out of 711, prevalence rate = 6.2%)
Sensitivity 86.4% 95.5% 95.5%
Specificity 79.9% 74.2% 71.4%
Positive predictive value 22.1% 19.6% 18.0%
Predicting suicide attempts in the past 12 months (20 out of 711, prevalence rate = 2.8%)
Sensitivity 100.0% 100.0% 100.0%
Specificity 78.0% 71.9% 69.2%
Positive predictive value 11.6% 9.3% 8.6%
  1. Note. SIQ = Suicidal Ideation Questionnaire; SIQ-JR = Suicidal Ideation Questionnaire-Junior; SIQ-JR-4 = four-item short version of SIQ-JR (SIQ-JR items 2, 3, 4, and 11). a. Cutoff value was set at the value that maximized the Youden index (defined as “sensitivity + specificity-1”). b. Though in predicting suicide attempts in the past 12 months, cutoff of 7 had higher Youden index (0.75) than cutoff of 6 (Youden index = 0.72), cutoff for the SIQ-JR was decided at 6 for the purpose of consistent result in predicting suicidal ideation in the past 12 months.