Table 3.

Baseline characteristics

	All (n=1,090)	SC (n=785)	IV (n=305)	ETN (n=440)	ADA (n=345)	IFX (n=201)	ABA (n=104)
Agea,b	49.66±9.44	49.25±9.43	50.72±9.4	48.99±9.82	49.58±8.9	49.77±9.52	52.57±8.93
Age categoryb
18–34	8.26	8.79	6.89	10.45	6.67	7.46	5.77
35–44	17.8	18.73	15.41	18.64	18.84	17.41	11.54
45–54	38.53	39.11	37.05	37.95	40.58	40.3	30.77
55–63	35.41	33.38	40.66	32.95	33.91	34.83	51.92
Female	77.52	76.43	80.33	77.73	74.78	78.61	83.65
Male	22.48	23.57	19.67	22.27	25.22	21.39	16.35
Regiona–c
Northeast	28.17	26.24	33.11	23.64	29.57	33.33	32.69
South	20.46	21.78	17.05	20.45	23.48	15.42	20.19
Midwest	34.86	36.56	30.49	37.73	35.07	34.33	23.08
West	14.4	13.12	17.7	15.91	9.57	14.93	23.08
Other	2.11	2.29	1.64	2.27	2.32	1.99	0.96
Charlson Comorbidity Index	0.8±1.2	0.8±1.2	0.9±1.3	0.8±1.2	0.8±1.2	0.9±1.3	1.1±1.3

Notes: Values are presented as percent of patients except for age, which is the mean ± standard deviation years, and Charlson Comorbidity Index, which is the mean ± standard deviation units;

^aP<0.05 SC versus IV;

^bP<0.05 ETN versus ABA;

^cP<0.05 ETN versus ADA.

Abbreviations: ABA, abatacept; ADA, adalimumab; ETN, etanercept; IFX, infliximab; IV, intravenous; SC, subcutaneous.