Table 4 Comparison of reliability indexes between SPD-7 and SPD-10
Scale | Number of items | Cronbach alpha | Split half reliability | Score distribution | |||||
|---|---|---|---|---|---|---|---|---|---|
Value | Variance (%) | Value | Variance (%) | Value | Variance (%) | Score | Median (Q1, Q3) | Mean | |
SPD-10 | 10 | — | 0.80 | — | 0.76 | — | 17.50 ~ 95.00 | 65.00 (50.00 ~80.00) | 64.51 |
SPD-7 | 7 | 30.00 | 0.78 | 2.14 | 0.75 | 1.44 | 10.71 ~ 100.00 | 65.00 (50.89~78.57) | 64.77 |