Table 3.
Reliability of the Norwegian version of the SS-QOL scale – data quality, internal consistency, floor and ceiling effects and test–retest reliability.
| SS-QOL domain (N = 125) | Numbers of items | Missing (%) | Mean (SD) | Internal consistency Cronbach’s α | Floor and ceiling effects (%) | Test–retest reliability (N = 36) |
||
|---|---|---|---|---|---|---|---|---|
| Spearman’s ρ | p | |||||||
| Mobility | 6 | 2 | 4.28 (0.92) | 0.93 | 0.8 | 36.0 | 0.84 | <0.001 |
| Energy | 3 | 2 | 3.36 (1.45) | 0.92 | 11.1 | 29.4 | 0.67 | <0.001 |
| Upper extremity function | 5 | 0.5 | 4.28 (1.04) | 0.93 | 1.6 | 43.7 | 0.94 | <0.001 |
| Work and Productivity | 3 | 1 | 4.21 (1.07) | 0.92 | 3.2 | 47.6 | 0.94 | <0.001 |
| Mood | 5 | 2 | 3.93 (1.05) | 0.84 | 1.6 | 27.8 | 0.84 | <0.001 |
| Self-care | 5 | 0 | 4.46 (0.93) | 0.92 | 2.4 | 54.8 | 0.89 | <0.001 |
| Social roles | 5 | 3 | 3.29 (1.30) | 0.91 | 7.1 | 15.9 | 0.80 | <0.001 |
| Family roles | 3 | 2 | 3.96 (1.19) | 0.83 | 2.4 | 38.9 | 0.79 | <0.001 |
| Vision | 3 | 0 | 4.58 (0.75) | 0.79 | 1.6 | 62.7 | 0.35 | <0.05 |
| Language | 5 | 0.3 | 4.59 (0.70) | 0.91 | 0.8 | 56.3 | 0.74 | <0.001 |
| Thinking | 3 | 2 | 3.79 (1.19) | 0.83 | 3.2 | 32.5 | 0.65 | <0.001 |
| Personality | 3 | 2 | 3.99 (1.18) | 0.87 | 2.4 | 41.3 | 0.83 | <0.001 |
| SS-QOL total | 49 | 1.4 | 4.09 (0.80) | 0.97 | 0.8 | 8.8 | 0.89 | <0.001 |