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Knee OA is the leading cause of disability and pain among adult and old age populations. An estimated 10 to 15% of all adults older than 60 years have some degree of OA, with prevalence higher among women than men.

Other newly named protected industries ranged from grocery and pharmacy workers, to food manufacturers and suppliers, to animal and food testing, to sanitation and pest control workers.
The guidance letter specifically notes its recommendations ultimately are advisory in nature, and the list should not be considered a federal directive. Individual jurisdictions can add or subtract essential workforce categories based on their own requirements and discretion.