Table 2.

Logistic regression results for the association OA and WWI.

Variables	Model 1		Model 2		Model 3		Model 4
	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P
WWI	1.70 (1.54 ~ 1.88)	< 0.001	1.70 (1.54 ~ 1.88)	< 0.001	1.68 (1.51 ~ 1.87)	< 0.001	1.65 (1.48 ~ 1.84)	< 0.001
WWI quantile
Q1	(Reference)		(Reference)		(Reference)		(Reference)
Q2	2.11 (1.56 ~ 2.85)	< 0.001	2.10 (1.56 ~ 2.84)	< 0.001	2.07 (1.53 ~ 2.80)	< 0.001	2.01 (1.48 ~ 2.72)	< 0.001
Q3	2.64 (1.97 ~ 3.53)	< 0.001	2.62 (1.96 ~ 3.51)	< 0.001	2.52 (1.87 ~ 3.38)	< 0.001	2.42 (1.79 ~ 3.25)	< 0.001
Q4	3.84 (2.91 ~ 5.08)	< 0.001	3.83 (2.90 ~ 5.07)	< 0.001	3.63 (2.72 ~ 4.83)	< 0.001	3.41 (2.55 ~ 4.57)	< 0.001
P for trend	< 0.001		< 0.001		< 0.001		< 0.001

OR Odds ratio, CI confidence interval.

Model 1: Crude.

Model 2: Adjust: Gender, Age, Race.

Model 3: Adjust: Gender, Age, Race, PIR, Alcohol, level, BMI, edu, Marital, Smoke.

Model 4: Adjust: Gender, Age, Race, PIR, Alcohol, level, BMI, hypertension, failing_kidneys, OP, edu, Marital, sleep_disorder, Smoke, diabetes.