Table 1. Clinical-demographic data of patients with sUCTD in comparison with SLE-matched controls.

Variable	UCTD(n=141)	SLE(n=153)	P value
Age at last visit	48.5±12.6	45.6±12.2	0.022
Follow-up duration (first visit-last visit, years)	8.0 (5–13)	7.0 (4–14)	NS
Age at first symptom (years)	33.5 (25–44)	32.0 (24–42)	NS
Age at diagnosis (years)	37.0 (29–47)	36.0 (28–46)	NS
Duration of symptoms at first visit (months)	12.0 (6–36)	NA
Disease duration at last visit (years)	8.0 (5–12)	9.0 (3–15)	NS

Data are expressed as median and intequartile range IQR.

NA, not availableNS, not significantSLEsystemic lupus erythematosussUCTDstable UCTDUCTDundifferentiated connective tissue disease