Table 3.

Association between weight-adjusted-waist index (cm/√kg) and rheumatoid arthritis prevalence

Exposure	Model 1 [OR (95% CI)]	Model 2 [OR (95% CI)]	Model 3 [OR (95% CI)]
WWI (quartile)
Quartile 1	reference	reference	reference
Quartile 2	2.00 (1.60, 2.50)	1.49 (1.19, 1.87)	1.34 (1.07, 1.69)
Quartile 3	3.24 (2.63, 3.98)	1.95 (1.57, 2.43)	1.60 (1.27, 2.00)
Quartile 4	4.04 (3.29, 4.94)	2.02 (1.62, 2.54)	1.43 (1.13, 1.82)
P for trend	< 0.0001	< 0.0001	0.0145

Model 1: no covariates were adjusted. Model 2: age;gender;race were adjusted. Model 3: age; gender; race; diabetes; PIR; ALT; AST; ALP; BUN; total calcium; uric acid; total cholesterol; triglyceride; LDL-C; direct HDL-C; diabetes status; education level; smoking status; alcohol abuse; sleep disorders; moderate recreational activities were adjusted

Abbreviation: PIR ratio of family income to poverty, BMI body mass index, LDL-C low-density lipoproteincholesterol, HDL-C high-density lipoprotein cholesterol, AST aspartate aminotransferase, ALT alanine aminotransferase, ALP alkaline phosphatase, BUN blood urea nitrogen