Table 5.

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

	OR (95% CI)	P for interaction
Stratified by gender		0.2617
Males	1.21 (1.05, 1.41)
Females	1.10 (0.98, 1.23)
Stratified by race		0.3966
Mexican American	1.41 (1.08, 1.85)
Other Hispanic	1.06 (0.80, 1.41)
Non-Hispanic White	1.22 (1.05, 1.42)
Non-Hispanic Black	1.07 (0.92, 1.25)
Other Race	1.07 (0.77, 1.48)
Stratified by age		0.0024
<65	0.43 (0.27, 0.59)
≥ 65	0.14 (0.04, 0.24)
Stratified by diabetes		0.8234
Yes	1.19 (0.99, 1.44)
No	1.14 (1.02, 1.27)
Borderline	1.03 (0.64, 1.65)
Stratified by education level		0.6737
Less than high school	1.10 (0.93, 1.30)
High school	1.22 (1.03, 1.45)
Above high school	1.13 (0.99, 1.28)
Stratified by smoking status		0.3642
Now	1.21 (1.07, 1.38)
Former	1.07 (0.93, 1.24)
Never	1.05 (0.80, 1.39)
Stratified by alcohol abuse		0.1062
Yes	1.18 (1.07, 1.31)
No	0.98 (0.80, 1.20)
Stratified by sleep disorders		0.1973
Yes	1.20 (1.06, 1.35)
No	1.06 (0.93, 1.22)
Stratified by working hours (Usually work 35 or more hours per week)		0.3751
Yes	1.20 (1.04, 1.39)
No	1.12 (1.01, 1.24)
Stratified by moderate recreational activities		0.4829
Yes	1.10 (0.96, 1.27)
No	1.17 (1.05, 1.30)

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