RESUMO
Background: Quantification of change is crucial for correctly estimating the effect of a treatment and for distinguishing random or non-systematic changes from substantive changes. The objective of the present study was to learn about the performance of two distribution-based methods [the Jacobson-Truax Reliable Change Index (RCI) and the Hageman-Arrindell (HA) approach] that were designed for evaluating individual reliable change. Methods: A pre-post design was simulated with the purpose to evaluate the false positive and false negative rates of RCI and HA methods. In this design, a first measurement is obtained before treatment and a second measurement is obtained after treatment, in the same group of subjects. Results: In relation to the rate of false positives, only the HA statistic provided acceptable results. Regarding the rate of false negatives, both statistics offered similar results, and both could claim to offer acceptable rates when Ferguson's stringent criteria were used to define effect sizes as opposed to when the conventional criteria advanced by Cohen were employed. Conclusion: Since the HA statistic appeared to be a better option than the RCI statistic, we have developed and presented an Excel macro so that the greater complexity of calculating HA would not represent an obstacle for the non-expert user.
RESUMO
La presente investigación estudia la efectividad de talleres basados en Psicología Positiva en adultos mayores, mediante el análisis de las variaciones pre-post del niveles de Satisfacción Vital y Sintomatología Depresiva. Se conformó tres grupos: el primero, un grupo cuasi experimental, basado en Psicología Positiva; el segundo, un grupo cuasi control activo, basado en actividades recreativas; y el tercero, un grupo cuasi control inactivo, sin intervención. Se utilizó la Escala de Depresión Geriátrica de Yesavage y Escala de Satisfacción Vital de Diener. Los resultados indican que sólo el grupo con taller basado en Psicología Positiva disminuye significativamente su Sintomatología Depresiva y aumenta significativamente sus niveles de Satisfacción Vital, luego de la intervención. Estos resultados se discuten a la luz de las investigaciones actuales en Psicología Positiva...
This research examines the effectiveness of workshops based on positive psychology for the elderly by analyzing pre-post changes in levels of life satisfaction and depressive symptomatology. Three groups were formed: the first, a quasi-experimental group based on positive psychology; the second, a quasi-active control group based on recreational activities; and the third, a quasi-inactive control group without intervention. The instruments used were: Yesavage Geriatric Depression Scale and Life Satisfaction Scale of Diener. Results indicated that only the group that attended positive psychology-based workshops significantly decreased depressive symptoms and significantly increased their levels of life satisfaction after the intervention. These results are discussed in the light of current researches in positive psychology...