Table 5.
Items with below threshold item-convergent validity at baseline (week 0) and end of core phase (week 18) for each HRQL measure.
| HRQL Measure | Item convergent validity |
Item discriminant validity | |
|---|---|---|---|
| Subscale/domain (n = items) | Correlation coefficient | ||
| QOLCE | Behavior (n = 4) | 0.158–0.377 | All items met the criterion for discriminant validity |
| Anxiety (n = 3) | 0.047–0.399 | ||
| Depression (n = 2) | 0.045–0.340 | ||
| Social interactions (n = 2) | 0.054–0.248 | ||
| Physical restrictions (n = 1) | 0.128–0.194 | ||
| Control/helplessness (n = 1) | 0.069–0.266 | ||
| Self-esteem (n = 1) | 0.284–0.335 | ||
| QOLIE-AD-48 | School behavior (n = 2) | 0.241–0.395 | All items met the criterion for discriminant validity |
| Epilepsy impact (n = 1) | 0.278–0.326 | ||
| Physical functioning (n = 1) | 0.333–0.386 | ||
| Health perceptions (n = 1) | 0.161–0.258 | ||
| QOLIE-31-P | Medication effects (n = 1) | 0.294–0.324 | All items met the criterion for discriminant validity |
| Social function (n = 1) | 0.283–0.311 | ||