Evidence of validity of a Jealousy Scale in Peruvian youth and adults: An item response theory approach

Introduction/Objective: In romantic relationships, jealousy can influence how individuals feel emotionally and interact with their partners. This study analysed the metric properties of the Brief Jealousy Scale (BJS) in young adults from Peru using current methods. Method: A total of 297 individuals were selected to participate in the study. They averaged 26.52 years of age (with a variation of 7.75 years), and 74.10% were women. The study used a technique called Item Response Theory (IRT) with a two-parameter model to confirm the structure and reliability of the BJS. Result: The BJS demonstrated high reliability and fit through goodness-of-fit indices. DIF analysis indicated slight gender biases in some items, reflecting differences in the perception of jealousy between men and women. Conclusions: The study highlights the importance and usefulness of the Jealousy Scale in relationships, as it helps to understand relationship dynamics and guides interventions. Future studies should address issues such as participant selection and study design and examine whether the scale can be used in different cultures.