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Published in: Quality of Life Research 10/2019

01-10-2019

Longitudinal measurement invariance of the Satisfaction With Life Scale in adolescence

Authors: Igor Esnaola, Manuel Benito, Iratxe Antonio-Agirre, Inge Axpe, Margarita Lorenzo

Published in: Quality of Life Research | Issue 10/2019

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Abstract

Purpose

The main purpose of this research was to examine the longitudinal measurement invariance of the Satisfaction With Life Scale (SWLS) in adolescence.

Method

The sample was composed by 484 adolescents from Spain, 46.7% were males. All participants belonged to six academic levels from Grade 7 to Grade 12, and answered the questionnaires at two different times: at the beginning (Mage1 = 14.95, SD1 = 1.81) and at the end of the school year (Mage2 = 15.61, SD2 = 1.81). The reliability of the scale was obtained through Cronbach’s alpha, Guttman lambda, and MacDonald’s Omega total. The multiple group confirmatory factor analysis (MGCFA) was used to examine the fit of the unifactorial model to data and to test the measurement of longitudinal invariance of the scale across two time points (at the beginning T1, and the end T2, of the academic year), and the time points and groups (gender and age).

Results

The values of the single-factor SWLS structure were T1 (CFI1 = 1.000, TLI1 = .997, RMSEA1 = .080, and SRMR1 = .028), and T2 (CFI2 = .997, TLI2 = .995, RMSEA2 = .032, and SRMR2 = .034). On the other hand, values of the reliability and composite reliability when analyzing both time points together as well as separately were as follows: Cronbach’s alpha = .86, Guttman’s lambda = .84, McDonald’s Omega total = .89. Results confirmed the longitudinal invariance of SWLS. The differences in gender and age were not significant and the small differences across time points showed that the means of the latent factor remained the same over time in both variables.

Conclusion

The present study confirmed the single-factor structure of the SWLS in Spanish adolescents, as well as a good reliability and composite reliability. The full longitudinal measurement invariance was also found and there were negligible differences across time points considering gender and age. If these findings are further replicated, the scale could be used to compare the life satisfaction across two time points considering different age and gender groups.
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Metadata
Title
Longitudinal measurement invariance of the Satisfaction With Life Scale in adolescence
Authors
Igor Esnaola
Manuel Benito
Iratxe Antonio-Agirre
Inge Axpe
Margarita Lorenzo
Publication date
01-10-2019
Publisher
Springer International Publishing
Published in
Quality of Life Research / Issue 10/2019
Print ISSN: 0962-9343
Electronic ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-019-02224-7

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