Table 2.

Determinants of maintaining treatment unchanged

	Odds ratio	95% confidence interval	P value
Patient's global assessment of disease activity	0.15	0.11 to 0.21	< 0.0001
Erythrocyte sedimentation rate	0.49	0.37 to 0.65	< 0.0001
Number of tender joints	0.34	0.23 to 0.49	< 0.0001
Number of swollen joints	0.004	0.003 to 0.005	< 0.0001
Interaction (number of tender joints × number of swollen joints)	2.06	1.51 to 2.82	< 0.0001

Determined using multivariate logistic regression, n = 7,224. Overall, all 28-joint disease activity score (DAS28) components are significant determinants of the decision to maintain treatment unchanged. All variables are transformed according to the DAS28 formula.