Interpersonal Needs Questionnaire (INQ-15)
The INQ-15 (Van Orden et al., 2012) is a 15-item self-report assessment of thwarted belongingness (9 items; Cronbach’s alpha = .88),) and perceived burdensomeness (6 items; Cronbach’s alpha = .91). Each item is rated on a 7-point Likert-type scale ranging from 1 (not at all true for me ) to 7 (very true for me ). Scores are coded in a way where higher scores indicate greater severity of thwarted belongingness and perceived burdensomeness. The INQ-15 has demonstrated strong psychometric properties (Van Orden et al., 2012).

Depressive Symptom Index-Suicidality Subscale (DSI-SS)

The DSI-SS (Joiner et al., 2002) is a four-item self-report assessment developed to evaluate suicidal ideation severity. This measure assesses the frequency and intensity of suicidal ideation and impulses in the past 2 weeks. Scores on items range from 0 to 3; item scores are summed for a total score, with higher scores indicating a higher severity of suicidal ideation. The DSI-SS demonstrated good internal consistency and construct validity in the validation study (Joiner et al., 2002).