Evaluating the Interpersonal Needs Questionnaire: Comparison of the Reliability, Factor Structure, and Predictive
Ryan M Hill1, Yasmin Rey1, Carla E Marin2
1Department of Psychology, Florida International University, Miami, FL, USA.
Suicide & Life-Threatening Behavior
|October 14, 2014
Summary
The Interpersonal Needs Questionnaire (INQ) has multiple versions. The 10-item and 15-item INQ versions best predict suicidal ideation, showing perceived burdensomeness and thwarted belongingness are key factors.
Area of Science:
- Psychology
- Clinical Psychology
- Psychometrics
Background:
- The Interpersonal Needs Questionnaire (INQ) measures perceived burdensomeness and thwarted belongingness, factors linked to suicidal ideation.
- Multiple INQ versions (10-, 12-, 15-, 18-, 25-item) exist, leading to mixed findings in previous research.
- Differences in measurement scales may explain inconsistent results regarding INQ versions and suicidal ideation.
Purpose of the Study:
- To evaluate the factor structure, internal consistency, and concurrent predictive validity of five INQ versions.
- To determine which INQ version(s) are most reliable and valid for assessing constructs related to suicidal ideation.
- To provide evidence-based recommendations for future research on INQ usage.
Main Methods:
- Confirmatory factor analyses were conducted on three independent samples (N=449 undergraduates, N=218 undergraduates, N=114 adolescent psychiatric inpatients).
- Internal consistency and concurrent predictive validity of the 10-, 12-, 15-, 18-, and 25-item INQ versions were assessed.
- Statistical analyses compared the psychometric properties and predictive power of the different INQ versions.
Main Results:
- All five INQ versions demonstrated acceptable internal consistency across the samples.
- The 10-item and 15-item INQ versions exhibited the best and most consistent model fit in confirmatory factor analyses.
- Only the 10-item INQ version showed that both perceived burdensomeness and thwarted belongingness consistently predicted concurrent suicidal ideation.
Conclusions:
- The 10-item and 15-item versions of the Interpersonal Needs Questionnaire demonstrate superior psychometric properties.
- The 10-item INQ is particularly effective, as it reliably predicts suicidal ideation based on perceived burdensomeness and thwarted belongingness.
- Future research should prioritize the use of the 10-item or 15-item INQ for consistent and valid measurement.
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