A question on control selection Hsiu-Nien Shen, Chi Mei Medical Center 13 July 2015 Based on the flowchart of the study, it appears that controls who have dementia before the index date (as being matched with that of patients with gout) are not excluded. This may cause a bias overestimating the risk estimate. Competing interests None declared.
A question on control selection
13 July 2015
Based on the flowchart of the study, it appears that controls who have dementia before the index date (as being matched with that of patients with gout) are not excluded. This may cause a bias overestimating the risk estimate.Competing interests
None declared.