Validation of a Prediction Rule for the Diagnosis of Rheumatoid Arthritis in Patients with Recent Onset Undifferentiated Arthritis

Table 4

Logistic regression including van der Helm-van Mil score as a dichotomous variable.

Variable	Odds ratio	95% CI	𝑃 value
Age	0.95	0.93–0.99	0.049
Symmetric involvement	0.71	0.2–2.2	0.564
HAQ	0.85	0.4–2	0.710
ESR	0.99	0.96–1.02	0.545
DAS28	1.1	0.5–2.4	0.888
Disease duration (months)	0.99	0.9–1.1	0.934
vHvM score >8	17.99	4.5–71.9	<0.0001

ESR: erythrosedimentation rate; HAQ: Health Assessment Questionnaire; vHvM score >8: van der Helm-van Mil score equal or greater than 8; DAS28: disease activity score for 28 joints.