Table 3.

Multivariable logistic regression models

	Model based on factors		Model based on factors without shoulder tenderness plus presence of RF/ACPA		Model based on factors plus presence of RF/ACPA and MHAQ
Criterion	Odds ratio (95% CI)	p Value	Odds ratio (95% CI)	p Value	Odds ratio (95% CI)	p Value
Hip pain or limited hip range of motion	2.7 (1.5 to 4.8)	0.001	2.1 (1.1 to 4.0)	0.019	1.6 (0.8 to 3.2)	0.16
Other joint pain	0.4 (0.2 to 0.6)	<0.001	0.4 (0.2 to 0.7)	0.002	0.3 (0.1 to 0.6)	<0.001
Morning stiffness >45 min duration	5.2 (2.9 to 9.4)	<0.001	6.2 (3.2 to 11.8)	<0.001	4.8 (2.4 to 9.6)	<0.001
Shoulder tenderness	0.9 (0.5 to 1.8)	0.80
Presence of RF or ACPA			0.3 (0.1 to 0.8)	0.009	0.3 (0.1 to 0.8)	0.013
MHAQ, per 1 unit increase					2.4 (1.4 to 4.2)	0.002
Likelihood ratio test for additional terms			p<0.001		p<0.001
c-Statistic	79%		81%		81%

ACPA, anticitrullinated protein antibody; MHAQ, modified health assessment questionnaire; RF, rheumatoid factor.