Table 2.

Association between weight-adjusted-waist index (cm/√kg) and osteoarthritis 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	2.03 (1.74, 2.37)	1.26 (1.07, 1.48)	1.17 (0.99, 1.38)
Quartile 3	3.10 (2.68, 3.58)	1.39 (1.19, 1.63)	1.26 (1.07, 1.48)
Quartile 4	5.01 (4.36, 5.76)	1.57 (1.34, 1.84)	1.37 (1.16, 1.63)
P for trend	< 0.0001	< 0.0001	0.0002

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