Results: Based on the factor analysis results, the subscale ‘‘disturbance of reality testing’’ was removed, and six factors were
left. The internal consistency and concurrent validity of SAS were verified (Cronbach’s alpha = 0.967). SAS and its subscales
were significantly correlated with K-scale and Y-scale. The VAS of each factor also showed a significant correlation with each
subscale. In addition, differences were found in the job (p,0.05), education (p,0.05), and self-reported smartphone
addiction scores (p,0.001) in SAS.
Conclusions: This study developed the first scale of the smartphone addiction aspect of the diagnostic manual. This scale
was proven to be relatively reliable and valid.