“Background Positive relationships are one of the most important components within the PERMA model since they facilitate the development of the other components. However, in the scientific literature, few instruments have been identified with solid psychometric properties that measure positive relationships in university students and adequately represent the construct. Therefore, the study aims to develop and study the psychometric properties of the PRI+19 positive relationships scale through Confirmatory Factor Analysis, factorial invariance, and relationshipbased validity with other variables. Method A pilot sample of 201 university students (43.8% men and 56.2 women) between the ages of 18 and 34 (M=20.9; SD=2.74) was collected. The confirmatory sample consisted of 450 university students of both sexes (30.2% men and 69.8 women) between the ages of 18 and 35 years (M=21.9; SD=3.15)....

“Background Positive relationships are one of the most important components within the PERMA model since they facilitate the development of the other components. However, in the scientific literature, few instruments have been identified with solid psychometric properties that measure positive relationships in university students and adequately represent the construct. Therefore, the study aims to develop and study the psychometric properties of the PRI+19 positive relationships scale through Confirmatory Factor Analysis, factorial invariance, and relationshipbased validity with other variables. Method A pilot sample of 201 university students (43.8% men and 56.2 women) between the ages of 18 and 34 (M=20.9; SD=2.74) was collected. The confirmatory sample consisted of 450 university students of both sexes (30.2% men and 69.8 women) between the ages of 18 and 35 years (M=21.9; SD=3.15)....