Table 1.

Patient characteristics

	Calibration	Cross-validation
	sample	sample
	(n = 1791)	(n = 532)
Sex, % female	69.2	63.0
Age in years, mean (SD)	56.54 (13.31)	56.48 (14.26)
HAQ-SDI (0–3), mean (SD)*	1.08 (0.71)	0.65 (0.65)
PF-10 (0–100), mean (SD)	53.89 (26.35)	67.39 (25.71)
DAS28, mean (SD)*	-	4.28 (1.51)
VAS Pain (0–100), mean (SD)*	-	43.38 (26.23)
VAS General Health (0–100), mean (SD)*	-	44.49 (26.48)

HAQ-SDI = Health Assessment Questionnaire standard disability index; PF-10 = SF-36 physical functioning scale; DAS28 = 28-joint Disease Activity Score; VAS Pain = visual analog scale for patient’s pain in the past week; VAS General Health = visual analog scale for patient’s general health in the past week. * Higher values indicate worse health states.