Table 4 Examples of construct validity hypotheses (full list available in Additional file 1 )
| Â | Correlated to | |||
|---|---|---|---|---|
Questionnaire (subscale or item number) | Hypothesized correlation | Comment | Obtained correlation a | |
FHS (phys. suffering) | CHQ-PF50 (bodily pain) | Strong, negative | If pain is present in OM, it will also become apparent in more generalized questions. | -0.82 |
FHS (activity limitations) | No. of days observed lower activity level | Strong, positive | Both items regard the child’s activity level, although OM-6 item is more extensive. | 0.56 |
NRS-child | CHQ-PF50 (Global health) | Moderate, negative | Global health is likely to be affected by disease specific QoL. | -0.33 |
FHS (summary score) | CIQ FHS summary score | Strong, positive | Child FHS has a strong influence upon caregiver FHS. | 0.72 |