Table 1.

Support vector machine confusion matrices for the Leiden-B test set (n=1000) .

Clinician-based	Support vector machine 1 (cut-off=0.99)		Support vector machine 2 (cut-off=0.53)
	Non–rheumatoid arthritis	Rheumatoid arthritis	Non–rheumatoid arthritis	Rheumatoid arthritis
Non–rheumatoid arthritis	912 (true negative)	4 (false positive)	890 (true negative)	26 (false positive)
Rheumatoid arthritis	24 (false negative)	60 (true positive)	6 (false negative)	78 (true positive)