Table 4.

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

	OR (95% CI)	P for interaction
Stratified by gender		0.3371
Males	1.20 (1.07, 1.35)
Females	1.12 (1.03, 1.21)
Stratified by race		0.0400
Mexican American	1.06 (0.82, 1.35)
Other Hispanic	1.05 (0.82, 1.33)
Non-Hispanic White	1.05 (0.96, 1.16)
Non-Hispanic Black	1.37 (1.19, 1.57)
Other Race	1.16 (0.93, 1.45)
Stratified by age		0.2178
< 65	0.34 (0.20, 0.48)
≥ 65	0.24 (0.17, 0.31)
Stratified by diabetes		0.3539
Yes	1.18 (1.02, 1.37)
No	1.13 (1.05, 1.22)
Borderline	0.91 (0.66, 1.26)
Stratified by education level		0.8132
Less than high school	1.18 (1.02, 1.37)
High school	1.13 (0.99, 1.30)
Above high school	1.12 (1.03, 1.22)
Stratified by smoking status		0.3015
Now	1.26 (1.02, 1.55)
Former	1.15 (1.05, 1.26)
Never	1.06 (0.95, 1.19)
Stratified by alcohol abuse		0.0588
Yes	1.17 (1.08, 1.25)
No	0.98 (0.83, 1.16)
Stratified by sleep disorders		0.3993
Yes	1.16 (1.06, 1.26)
No	1.10 (1.00, 1.21)
Stratified by working hours (Usually work 35 or more hours per week)		0.0268
Yes	1.19 (1.10, 1.28)
No	1.01 (0.90, 1.14)
Stratified by moderate recreational activities		0.2370
Yes	1.08 (0.97, 1.20)
No	1.17 (1.08, 1.27)

In subgroup analyses stratified by sex, race, age, diabetes status,education level; smoking status, alcohol abuse, sleep disorders, moderate recreational activities, The model adjusted for covariates such 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 recreationalactivities, but the modeldid not adjust for the stratification variables themselves

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