Table 4.
Construct validity of the SarQoL overall score (n = 58)
| Variable | ρ | 95% CI |
|---|---|---|
| Convergent validity | ||
| SF-36 physical functioning | 0.819 | (0.709, 0.891) |
| SF-36 role limitation due to physical problems | 0.677 | (0.505, 0.797) |
| SF-36 bodily pain | 0.638 | (0.453, 0.771) |
| SF-36 general health | 0.755 | (0.614, 0.849) |
| SF-36 vitality | 0.750 | (0.607, 0.846) |
| SF-36 role limitation due to emotional problems | 0.448 | (0.213, 0.635) |
| SF-36 mental health | 0.618 | (0.424, 0.758) |
| EQ-5D mobility | −0.646 | (−0.776, −0.463) |
| EQ-5D usual activities | −0.411 | (−0.607, −0.169) |
| EQ-5D pain / discomfort | −0.472 | (−0.652, −0.241) |
| EQ-5D anxiety / depression | −0.620 | (−0.758, −0.429) |
| EQ-5D utility | 0.703 | (0.541, 0.814) |
| Divergent validity | ||
| SF-36 social functioning | −0.098 | (−0.352, 0.169) |
| EQ-5D self-care | −0.331 | (−0.545, −0.077) |
Note: ρ: correlation with the SarQoL overall score at baseline. Negative correlations for EQ-5D domains (except for utility) are due to reverse coding.
Abbreviation: CI, confidence interval.