A one-year follow up study was conducted on a sample of 940 Spanish adolescents aged mostly from 10 to 15 in order to explore the extent to which their subjective well-being (SWB) changes from one year to the next, and whether these changes are the same for both genders regardless of the instrument used to measure SWB. Participants responded to the same four SWB scales twice, with an interval of a year in between. A decrease in the levels of SWB is identified from the years 11–12 onwards, the decrease in girls being more marked. Multiple-item, domain-based scales (Brief Multidimensional Student’s Life Satisfaction Scale and Personal Well-Being Index) are more sensitive than single-item scales (Overall Life Satisfaction and Happiness Taking into Account Overall Life) in detecting this decrease. Implications for the study of SWB are discussed from a developmental perspectiveThis article is based on data collected in the research project with reference number PSI2010-19404 and PSI2013-41512-P, founded by the Spanish Ministry of Economy and Competitiveness (MINECO

An increasing number of scientific publications have provided data from different countries suggesting subjective well-being (SWB) continuously decreases during adolescence. A review of these publications reveals authors have used dissimilar scales in diverse countries. Using data from the international Children's Worlds project (N = 48,040), involving 15 countries, a comparative analysis was performed to determine how mean scores evolve with different SWB scales from the age of 8 onwards. The results support the hypothesis that the tendency of SWB to decrease with age starts at around 10 years of age in most countries, while also confirming that different psychometric scales display different levels of sensitivity to diverse sociocultural contexts and more than one should be used in any research on children and adolescents' SWB.

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This article presents the results of a one-year follow-up study on a sample of 940 adolescents, in which participants have been classified according to the changes they have experienced in their subjective well-being (SWB), measured by means of two different single-item scales (overall life satisfaction -OLSand happiness overall -HOL). A range of multinomial logistic regression models were employed to determine which factors lead to such differences. Results show that when OLS is considered, the factor most contributing to an increase in SWB is family self-concept, while the one most contributing to its decrease is satisfaction with the family. When HOL is taken as the dependent variable, the most important factor in predicting an increase in SWB is being valued in the future according to the amount of money I have, with life optimism being the most important factor in predicting its decrease. Only three indicators (the importance of being valued in the future according to the amount of money I have, feeling happy at home and satisfaction with myself) contribute to explaining both boys' and girls' models when OLS is taken as the dependent variable, while only one indicator (satisfaction with standard of living) is shared in both boys' and girls' models when HOL is the dependent variable. The resulting implications for adolescent SWB are discussed.

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