Development of a short form of the Japanese version of the Interpersonal Relationship Inventory.

The Interpersonal Relationship Inventory (Tilden, Nelson, & May, 1990a) is a 39-item self-report measure to assess three aspects (support, reciprocity, and conflict) of perceived social relationships. In this research, short forms of the Japanese version (Sumi, 2003) of the inventory were developed on the basis of data from two sources. For the item selection, data from 340 Japanese college students (148 women, 192 men; M age = 21.6 yr., SD = 1.6) who completed the original full form of the inventory were used to create three internally consistent short forms. The reliability and construct validity of the short forms were examined upon administering them to among 513 college students (226 women, 287 men; M age =19.9 yr., SD = 1.4). All the subscales of the short forms had acceptable internal consistency (alphas = .70-.90) and test-retest reliability (rs = .72-.81). Confirmatory factor analysis of each short form supported the fact that each form had a three-factor structure. Scores on the subscales shared acceptable overlapping variance with the corresponding subscale scores of the original full form, and these scores were weakly but significantly correlated with the scores for satisfaction with social support, loneliness, and perceived stress. All the short forms had acceptable reliability and construct validity.