Fig. 1
From: The burden of hip and knee osteoarthritis in Finnish occupational healthcare
The formation of the study cohorts. The all OA cohort (n = 51,068) including adult patients diagnosed with hip or knee OA was formed from the total number of consented patients at the end of the study period. The occupational healthcare (OCH) subcohort (n = 35,109) included those OA patients with occupational healthcare customership. The control cohort without OA (n = 35,101) was formed from the occupational healthcare customers in the total number of consented patients