Table 3.
Hypotheses for testing construct validity of the HPQ
| Hypotheses | Rationale | Correlation expected | HPQ Absolute | HPQ Relative | ||
|---|---|---|---|---|---|---|
| Correlation actual | Confirmed? | Correlation actual | Confirmed? | |||
| 1. There will be at least a moderate-strong negative correlation between the HPQ* and WLQ** | HPQ and WLQ measure similar constructs but asked differently (actual performance versus time of disturbed performance at work) | −0.4 | −0.41 | Yes | −0.25 | No |
| 2.There will be at least a weak to moderate positive correlation between HPQ and age | Older age has been identified in literature as a risk factor for work cessation (loosely related construct to work performance) | 0.2 | 0.2 | Yes | 0.07 | No |
| 3. There will be at least a weak to moderate negative correlation between HPQ and education | Lower education has been identified in literature as a risk factor for work cessation (loosely related construct to work performance) | −0.2 | −0.07 | No | −0.04 | No |
| 4. There will be at least a weak to moderate negative correlation between HPQ and HAQ score | Lower physical function has been identified as a risk factor for work cessation (loosely related construct to work performance) | −0.2 | −0.15 | No | −0.14 | No |
| 5. There will be at least a weak to moderate negative correlation between HPQ and job type (non-professional as reference group) | Non-professional jobs have been identified in literature as a risk factor for work cessation (loosely related construct to work performance) | −0.2 | 0.05 | No | 0.07 | No |
| 6. There will be at least a weak negative correlation between HPQ and pain score | Pain has been identified in the literature as correlate of work performance in one occasion only | −0.1 | −0.11 | Yes | −0.14 | Yes |
| 7. There will be at least a weak to moderate positive correlation between HPQ and self efficacy | Self efficacy has been identified in the literature as a correlate of work performance in at least two occasions | 0.2 | 0.29 | Yes | 0.05 | No |
*
HPQ: Health Performance Questionnaire
**
WLQ: Work Limitations Questionnaire
Correlation strength: r ≥ 0.5, Strong; 0.5 > r ≥ 0.4, Moderate-Strong; 0.4 > r ≥ 0.3, Moderate; 0.3 > r ≥ 0.2, Weak-Moderate; 0.2 > r ≥ 0.1, Weak; and 0.1 > r, Negligible.
†
Overall construct validity was assigned based on percent of total hypotheses confirmed: High ≥75%; Moderate, 50%≤ × <75%); or Poor <50%.