Table 2. Accuracy of 6MWT distance in predicting health-related quality of life scores.
| Median TC6 (m) | Sensitivity | Specificity | AUC (95%CI) | P value | |
|---|---|---|---|---|---|
| Overall sample | 447 | ||||
| PF | 0.58 | 0.26 | 0.67 (0.57–0.76) | 0.004 | |
| RE | 0.47 | 0.57 | 0.36 (0.26–0.46) | 0.08 | |
| RP | 0.56 | 0 | 0.81 (0.72–0.90) | <0.0001 | |
| SF | 0.50 | 0.50 | 0.55 (0.42–20.69) | 0.5 | |
| MH | 0.56 | 0.35 | 0.61 (0.52–0.70) | 0.04 | |
| VT | 0.51 | 0.41 | 0.56 (0.46–0.66) | 0.2 | |
| GH | 0.64 | 0.30 | 0.71 (0.62–0.80) | <0.001 | |
| Men | 481 | ||||
| PF | 0.62 | 0.13 | 0.79 (0.67–0.90) | <0.001 | |
| RE | 0.21 | 0.58 | 0.27 | 0.01 | |
| RP | 0.54 | 0 | 0.84 (0.72–0.95) | 0.01 | |
| SF | 0.53 | 0.28 | 0.62 (0.48–0.76) | 0.2 | |
| MH | 0.56 | 0.31 | 0.67 (0.54–0.80) | 0.03 | |
| VT | 0.56 | 0.31 | 0.67 (0.54–0.80) | 0.03 | |
| GH* | --- | --- | --- | --- | |
| Women | 420 | ||||
| PF | 0.54 | 0.29 | 0.56 (0.42–0.71) | 0.4 | |
| RE | 0.55 | 0.25 | 0.75 (0.53–0.97) | 0.02 | |
| RP | 0.54 | 0.11 | 0.80 (0.67–0.93) | 0.004 | |
| SF | 0.49 | 0.33 | 0.62 (0.33–0.92) | 0.4 | |
| MH | 0.52 | 0.41 | 0.54 (0.41–0.68) | 0.5 | |
| VT | 0.49 | 0.46 | 0.49 (0.34–0.65) | 0.9 | |
| GH | 0.85 | 0.39 | 0.75 (0.61–0.88) | 0.004 |
An SF-36 score of 50 was used, and the sensitivity and specificity of the test were set at the median 6MWT walk distance.
*There were no scores lower than 50 for quality of life on the general health domain; therefore, ROC curve analyses were not carried out. IC, confidence interval; PF, physical functioning; RE, role-emotional; RP, role-physical; SF, social functioning; MH, mental health; VT, vitality; GH, general health.