Table 1.

Baseline Characteristics of RA Patients Before and After PSM

Characteristics	Before PSM matched				After PSM matched			P value
	level	XFC (N=2036)	Non-XFC (N=6503)	P value	level	XFC (N=2036)	Non-XFC (N=4072)
Age (years), n (%)	Median (IQR)	62.0 (53.0 to 69.5)	55.0 (48.0 to 66.0)	<0.001	Median (IQR)	62.0 (53.0 to 69.5)	60.0 (53.0 to 69.0)	0.081
	>60	1058 (52%)	2469 (38%)	<0.001	>60	1058 (52%)	2015 (49.5%)	0.072
	18–60	978 (48%)	4034 (62%)		18–60	978 (48%)	2057 (50.5%)
Gender	Female	1556 (76.4%)	5470 (84.1%)	<0.001	Female	1556 (76.4%)	3277 (80.5%)	<0.001
	Male	480 (23.6%)	1033 (15.9%)		Male	480 (23.6%)	795 (19.5%)
Basic medicine, n (%)
TCM	Yes	1451 (71.3%)	4825 (74.2%)	0.010	Yes	1451 (71.3%)	2972 (73%)	0.166
	No	585 (28.7%)	1678 (25.8%)		No	585 (28.7%)	1100 (27%)
DMARDs	Yes	1491 (73.2%)	4361 (67.1%)	<0.001	Yes	1491 (73.2%)	2971 (73%)	0.846
	No	545 (26.8%)	2142 (32.9%)		No	545 (26.8%)	1101 (27%)
NSAIDs	Yes	1490 (73.2%)	3850 (59.2%)	<0.001	Yes	1490 (73.2%)	2908 (71.4%)	0.155
	No	546 (26.8%)	2653 (40.8%)		No	546 (26.8%)	1164 (28.6%)
Glucocorticoids	Yes	1259 (61.8%)	3970 (61%)	0.541	Yes	1259 (61.8%)	2545 (62.5%)	0.634
	No	777 (38.2%)	2533 (39%)		No	777 (38.2%)	1527 (37.5%)
End point events, n (%)
Readmission	Yes	806 (39.6%)	2786 (42.8%)	0.010	Yes	806 (39.6%)	1627 (40%)	0.803
	No	1230 (60.4%)	3717 (57.2%)		No	1230 (60.4%)	2445 (60%)
Extra articular lesions	Yes	394 (19.4%)	1301 (20%)	0.539	Yes	394 (19.4%)	787 (19.3%)	1.000
	No	1642 (80.6%)	5202 (80%)		No	1642 (80.6%)	3285 (80.7%)
Surgical treatment	Yes	48 (2.4%)	154 (2.4%)	1.000	Yes	48 (2.4%)	82 (2%)	0.433
	No	1988 (97.6%)	6349 (97.6%)		No	1988 (97.6%)	3990 (98%)
Death	Yes	74 (3.6%)	162 (2.5%)	0.008	Yes	74 (3.6%)	119 (2.9%)	0.155
	No	1962 (96.4%)	6341 (97.5%)		No	1962 (96.4%)	3953 (97.1%)