ABSTRACT
Resumen La Escala de Bienestar Subjetivo (EBS-20) y su versión corta (EBS-8) fueron desarrolladas y validadas para medir en población hispanohablante la satisfacción con la vida y el afecto positivo. El objetivo del presente estudio fue obtener evidencias adicionales de validez para la EBS-8. Para ello, se aplicó la escala en tres estudios sucesivos a un total de 2259 mexicanos de 12 a 81 años. Los resultados del primer estudio permitieron confirmar la estructura unifactorial (CMIN/DF = 2.336; CFI = .996; RMSEA = .047) y la adecuada confiabilidad de la escala (a = .958, co = .957); en el segundo se probó su invarianza de medición por sexo, grupo social y edad (A%2 p > .05, ACFI < .004, ARMSEA < .014); y en el tercer estudio se encontró, mediante la calibración de sus reactivos bajo la TRI, que la escala estima satisfactoriamente el constructo evaluado (a > 1.69; P1 entre -2.78 y -2.35). A partir de los índices psicométricos obtenidos, se concluye que la EBS-8 es un excelente instrumento breve construido en español para evaluar el bienestar subjetivo en adolescentes, jóvenes, adultos y adultos mayores.
Abstract The Subjective Well-Being Scale (EBS-20) and its short version (EBS-8) were developed and validated to measure life satisfaction and positive affect in a Spanish-speaking population. The aim of the present study was to obtain additional evidence of validity for the EBS-8. To this end, the scale was applied in three successive studies to a total of 2259 Mexicans aged 12 to 81 years. The results of the first study allowed us to confirm its unifactorial structure (CMIN/DF = 2.336; CFI = .996; RMSEA = .047) and its adequate reliability (a = .958, co = .957); in the second its measurement invariance by sex, social group and age was tested (A%2 p >. 05, ACFI < .004, ARMSEA < .014); and in the third study it was found, by calibrating its items under IRT, that the scale satisfactorily estimates the construct assessed (a > 1.69; b1 between -2.78 and -2.35). From the psychometric indices obtained, it is concluded that the EBS-8 is an excellent brief instrument constructed in Spanish to assess subjective well-being in adolescents, young people, adults and older adults.