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. 2020 Sep 3;11:875. doi: 10.3389/fpsyt.2020.00875

Table 2.

Psychometric properties of the three scales in scale level (n = 1,108).

Psychometric testing IGDS-SF9 BSMAS SABAS Suggested cutoff
Ceiling effects (%) 0 0 0 <20
Floor effects (%) 24.6 28.2 25.7 <20
Internal consistency (Cronbach’s α) 0.84 0.73 0.81 >0.7
Confirmatory factor analysis (CFA)
χ2 (df) 200.71(27) 25.93 (9) 19.51 (9) Nonsignificant
Comparative fit index 0.98 0.99 1.00 >0.9
Tucker-Lewis index 0.98 0.99 1.00 >0.9
RMSEA 0.076 0.041 0.032 <0.08
SRMR 0.067 0.033 0.023 <0.08

IGDS-SF9, Internet Gaming Disorder Scale–Short-Form; no modification indices were done in the CFA; BSMAS, Bergen Social Media Addiction Scale; no modification indices were done in the CFA; SABAS, Smartphone Application-Based Addiction Scale; no modification indices were done in the CFA; RMSEA, Root-mean square error of approximation; SRMR, Standardized root mean square residual.