Table 2.

Associations Between Dietary Niacin Intake and Odds Ratios (95% Confidence Intervals) for Rheumatoid Arthritis, NHANES 2003–2016

OR (95% CI)
Participants	Crude	Model I	Model II
All participants	0.97 (0.95–0.98)***	0.98 (0.97–0.99)*	0.98 (0.97–0.99)*
Dietary niacin intake (mg/day)
Q1 (≤14.95)	Ref.	Ref.	Ref.
Q2 (14.95–19.65)	0.82 (0.64–1.05)	0.95 (0.73–1.23)	0.94 (0.72–1.22)
Q3 (19.65–25.63)	0.65 (0.47–0.89)	0.78 (0.56–1.10)	0.78 (0.56–1.09)
Q4 (>25.63)	0.46 (0.34–0.63)	0.63 (0.44–0.88)	0.63 (0.45–0.89)
P for trend	<0.001	0.036	0.047

Note: Crude: Unadjusted; Model I: Adjusted for age, race, PIR, education level, BMI, alcohol consumption, smoking; Model II: Adjusted for age, race, PIR, education level, BMI, alcohol consumption, smoking, diabetes, hypertension, white blood cell count, red blood cell count, mean platelet volume, systemic immune-inflammatory index.*P-value<0.05, ***P-value< 0.001.