The associations between parity, other reproductive factors, and osteoarthritis in women aged over 50 years; data from the Korean National Health and Nutrition Examination Survey V (2010-2012)

Parity was associated with higher risk of radiographic knee OA. Vaginal delivery was positively associated with symptomatic back OA, but negatively associated with radiographic knee OA. Further study is required to evaluate the mechanism between delivery mode and subsequent OA.