Fig. 1From: The effect of interactions between BMI and sustained depressive symptoms on knee osteoarthritis over 4 years: data from the osteoarthritis initiativeParticipant Selection from the OAI. Note that sustained depressive symptoms were defined based on The Center for Epidemiological Studies Depression Scale (threshold ≥16) at the baseline and 4-year follow-up visit [13, 16]Back to article page