Validation study reveals superior predictive validity of the full Work Ability Index in the general population, suggesting three specific items can serve as practical survey proxies.
The full WAI has acceptable predictive validity, and is superior to its individual items. For public health surveys, three items may be suitable proxies of the full WAI; current work ability compared with lifetime best, estimated work impairment due to diseases, and number of current diseases diagnosed by a physician.
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Lundin et al. (2017) studied this question.
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