El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. / This letter has the purpose to comment the article by Marwaha et al. regarding affective instability and mental disorders. We wish to highlight the importance to report the proper measures of association in case-control studies, and the impact of adjusting the results when finding associations with possible confounders in the bivariate analysis. / Revisión por pares / Revisión por pares