“…Terms such as “problematic smartphone use”, “smartphone addiction”, “smartphone overuse”, “smartphone amount use”, “smartphone use frequency”, and “nomophobia” were summarized according to findings as “problematic smartphone use”, abbreviated as “PSU”. Twelve studies used SAS (among them, seven studies used the short version) [ 40 , 47 , 48 , 51 , 52 , 53 , 56 , 57 , 63 , 65 , 66 , 67 ], Elhai et al [ 57 ] and Elhai and Contractor [ 56 ], who used SAS, also used an additional validated smartphone usage scale developed by the author, three studies used SPAI [ 49 , 50 , 64 ], in which Fortes et al [ 64 ] also used the Habitual Smartphone Use Questionnaire other than SPAI, one study used the Nomophobia Questionnaire (NMP-Q) [ 62 ], one study used the Adolescent Preoccupation with Screen Scale adapted to adult smartphone use [ 58 ], one study used TMD-brief [ 59 ], one study used the Smartphone Addiction Scale (SA) [ 60 ], one study used the Addictive Patterns of Use Scale (APU) [ 61 ], and one study used the Mobile Phone Use Scale [ 68 ]. All scales are validated except for the Habitual Smartphone Use Questionnaire, which was developed exclusively for the study by Fortes et al [ 64 ].…”