Fig. 2
From: Association between niacin intake and osteoarthritis in the US population based on NHANES 1999–2018
The dose-response relationship of the Niacin with the risk of OA. RCS curve adjustment factors: age, gender, race, education level, BMI, PIR, smoking status, drinking status, hypertension, and diabetes. The yellow line and green shading represent the OR and 95% confidence interval (CL) for the association between niacin and osteoarthritis (OA) risk. The two dashed lines represent the range of niacin intake around the median value (22.23). The inflection point is 33.53.
