Construct validity of 4 global measures of presenteeism (WPAI, WPS-A, WAI, QQ) with the multiitem presenteeism measures WALS and patient-reported health outcome measures. Values are r.
| Measures | WPAI | WPS-A | WAI | QQ-Quantity | QQ-Quality | QQ-Total* |
|---|---|---|---|---|---|---|
| Global presenteeism measures | ||||||
| WPAI | 1.0 | |||||
| WPS-A | 0.83 | 1.0 | ||||
| WAI | −0.65 | −0.62 | 1.0 | |||
| QQ-Quantity | −0.58 | −0.53 | 0.60 | 1.0 | ||
| QQ-Quality | −0.52 | −0.49 | 0.58 | 0.75 | 1.0 | |
| QQ-Total | −0.60 | −0.56 | 0.63 | 0.95 | 0.88 | 1.0 |
| Multiitem presenteeism measure | ||||||
| WALS | 0.65 | 0.64 | −0.55 | −0.50 | −0.49 | −0.54 |
| Health-related patient reported outcomes | ||||||
| VAS general health | 0.54 | 0.51 | −0.43 | −0.39 | −0.36 | −0.42 |
| EQ-5D | −0.54 | −0.54 | 0.48 | 0.37 | 0.39 | 0.42 |
| HAQ | 0.57 | 0.58 | −0.52 | −0.40 | −0.41 | −0.45 |
↵* For QQ-Total, the quality and quantity score are multiplied, resulting in a score between 0 and 100. WPS-A: Worker Productivity Scale-Arthritis (0 = no interference to 10 = complete interference); WPAI: Work Productivity and Activity Impairment Questionnaire (score 0 = condition no effect on work to 10 = condition completely prevented me from working); WAI: Work Ability Index (score 0 = completely unable to work to 10 = work ability at its best); QQ: Quality and Quantity scales (score 0 = practically nothing/very poor quality to 10 = normal quantity/very good quality); QQ-Total: Qquality; VAS: visual analog scale; HAQ: Health Assessment Questionnaire.