Background
The short version of the smartphone addiction scale (SAS-SV) is widely used to measure problematic smartphone useĀ (PSU). This study examined the validity and reliability of theĀ SAS-SV among Japanese adults, as well as cross-sectional and longitudinal associations with relevant mental health traits and problems.
Methods
Datasets from a larger project on smartphone use and mental health were used to conduct two studies. Participants were adults aged over 20 years who carried a smartphone.
Results
Study 1 (n = 99,156) showed theĀ acceptable internal consistency and structural validity of theĀ SAS-SV with a bifactor model with three factors. For the test-retest reliability of theĀ SAS-SV, the intraclass correlation coefficient (ICC)Ā was .70, 95% CI [.69, 70], when theĀ SAS-SV was measured seven and twelve months apart (n = 20,389). Study 2 (n = 3419) revealed that when measured concurrently, theĀ SAS-SV was strongly positively correlated with another measure of PSU and moderately correlated with smartphone use time, problematic internet useĀ (PIU), depression, the attentional factor of impulsiveness, and symptoms related to attention-deficit hyperactivity disorder and obsessive-compulsive disorder. When measured 12 months apart, the SAS-SV was positively strongly associated with another measure of PSU and PIU and moderately associated with depression.
Discussion
The structural validity of theĀ SAS-SV appeared acceptable among Japanese adults with the bifactor model. The reliability of theĀ SAS-SV was demonstrated in the subsequent seven- and twelve-month associations.
Conclusion
The cross-sectional and longitudinal associations of theĀ SAS-SV provided further evidence regarding PSU characteristics.