Table 1.

Patient characteristics by responder status (n = 3704). Values are median (interquartile range) unless otherwise stated.

	Respondents, n = 3156		Nonrespondents, n = 548
	Included in Regression Analysis, n = 2776	Excluded from Regression Analysis, n = 380	Nonrespondents, n = 548
Women, %	75	75	76
Age, yrs	61 (51–69)	68 (61–75)^*	65 (52–77)^**
Disease duration, yrs	7 (3–15)	8 (3–16)	8 (3–16)^**
s-CRP, mg/1	9 (4–12)	10 (5–16)^*	10 (5–16)^**
Swollen joint count	0 (0–2)	1 (0–2)	1 (0–2)
Tender joint count	1 (0–4)	1 (0–4)	1 (0–4)
Radiographic erosions, %	63	70^*	69^**
IgM-rheumatoid factor-positive, %	76	79	80
Biological therapy, %	21	19	16^**
Use of methotrexate, %	73	76	66^**
Glucocorticoid last month, %	19	26^*	25^**

↵* Statistically significant differences between respondents included in and excluded from the regression analysis (chi-square, Kruskal-Wallis).
↵** Statistically significant differences (chi-square, Kruskal-Wallis) between respondents and nonrespondents. s-CRP: serum C-reactive protein.