Abraham P. Buunk, Dick P. H. Barelds, Alfonso Urzúa Morales, Rosario Zurriaga Llorens, Pilar González Navarro, Pieternel Dijkstra, Frederick X. Gibbons
The present study investigated the structure of the Spanish version of the Iowa-Netherlands Comparison Orientation Measure (INCOM-E), an 11-item measure that assesses individual differences in social comparison orientation (SCO), i.e., the extent to which people compare themselves with others. Data came from samples from Spain (n = 1,133) and Chile (n = 2,757). Confirmatory Factor Analyses and Mokken Scale Analyses supported in both samples not the assumed two-factor structure, but a single factor structure, consisting of eight items. The resulting eight-item version of the INCOM-E was reliable in both samples, according the Gutmann’s lambda–2 (.82 in Spain and .83 in Chile), and correlated very strongly with the full-length INCOM-E (.93 in Spain and .97 in Chile). In both samples, there were significant sex differences, ps < .001 with small effect sizes, ƞ2 in both samples = .01,but in the Spanish sample women scored higher, and in the Chilean sample men scored higher in SCO. The relationship with age was negative and significant (ps < .001) in both samples, albeit small (r = .22 in Spain and .13 in Chile) Based on the present research, it is advised to use the shortened eight-item version of the INCOM-E in Spanish speaking countries.