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

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

	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%

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.

ISSN: 1477-7525