Table 2.

Associations between arthritis and lumbar bone mineral density

	Model 1, β (95% CI, P)	Model 2, β (95% CI, P)	Model 3, β (95% CI, P)
Non-arthritis	Reference	Reference	Reference
Arthritis	0.007 (− 0.001, 0.015) 0.0861	0.017 (0.008, 0.025) 0.0001	0.018 (0.010, 0.027) < 0.0001
Non-arthritis	Reference	Reference	Reference
Osteoarthritis or degenerative arthritis	0.013 (0.001, 0.025) 0.0293	0.023 (0.012, 0.035) 0.0001	0.023 (0.011, 0.035) 0.0001
Rheumatoid arthritis	0.000 (− 0.017, 0.018) 0.9733	0.010 (− 0.007, 0.027) 0.2599	0.014 (− 0.003, 0.031) 0.1074
Psoriatic arthritis	0.005 (− 0.039, 0.049) 0.8177	0.020 (0.000, 0.039) 0.0445	0.024 (0.005, 0.043) 0.0133
Do not know or refused	0.000 (− 0.015, 0.015) 0.9712	0.008 (− 0.006, 0.023) 0.2665	0.011 (− 0.004, 0.026) 0.1350

Model 1 no covariates were adjusted; Model 2 age, gender, and race were adjusted; Model 3 age, gender, race, educational level, body mass index, ratio of family income to poverty, vigorous recreational activities, smoked at least 100 cigarettes in life, blood urea nitrogen, total protein, total cholesterol, alkaline phosphatase, serum uric acid, serum sodium, serum potassium, serum phosphorus, and serum calcium were adjusted