Characteristics of the 6 candidate measures of at-work limitations/productivity (presenteeism). Adapted from Tang, et al. J Rheumatol 2014;41:165–763.
| Global Measures | Content Source | Concept | Recall Period | Disease Attribution | Comparative Referencing | Scaling |
|---|---|---|---|---|---|---|
| WAI | Item 1 from the Work Ability Index | Work ability | Current | None | In relation to lifetime best | 0–10 (0 = completely unable to work; assume best work ability = 10) |
| Multiplication of 2 items | How much work performed and the quality of the work | Last workday | None (N/A) | Compared to a normal “workday” | Quantity item: 0–10 (practically nothing to normal quantity); Quality item: 0–10 (very poor to normal quality) | |
| WPAI | Item 5 from the WPAI Questionnaire (specific health problem version) | Work productivity | Last 7 days | Can be adapted to any health condition | None | 0–10 (health problem had no effect on my work to completely prevented me from working) |
| WPS | Item 4 from the WPS survey | Interference with work productivity | Last month | Arthritis | None | 0–10 (no interference to complete interference) |
| Multiitem Measures | Concept | Scored Scales and Number of Items | Time Frame | |||
| WALS | Amount/level of difficulty | Single scale — summed score of 12 items | Not specified | |||
| WLQ-25 | Frequency/proportion of time having | 25 items across 4 work demands: physical demands; | Past 2 weeks | |||
| PDmod | difficulty | mental-interpersonal; time management; output demands | ||||
WPAI: Work Productivity and Activity Impairment Questionnaire; WPS: Arthritis-specific Work Productivity Survey; QQ: Quantity and Quality Method; WAI: Work Ability Index; WALS: Workplace Activity Limitations Scale; WLQ-25 PDmod: Work Limitations Questionnaire with modified physical demands scale.