Table 1.

Baseline Socio-Demographic Variables of African American Patients with Rheumatoid Arthritis (RA) from the CLEAR Registry^*

Variable	Total Cohort			Subset with Radiographic Scores
	CLEAR I n=357	CLEAR II n=418	p value†	CLEAR I n=294	CLEAR II n=167	p value†
Age at enrollment, years, mean (SD)	51.0 (13.2)	56.9 (11.6)	0.0103	50.6 (13.5)	56.2 (10.8)	0.0016
Age at RA onset, mean (SD)	50.0 (13.2)	45.0 (13.0)	0.7035	49.6 (13.5)	42.8 (12.4)	0.2290
Gender (female), %	82.4	87.3	0.0533	82.7	84.4	0.6228
Disease duration at enrollment, months, median (IQ 25–75)	11.5 (6.3–17.9)	108.0 (40.0–213.0)	<0.0001	12.1 (6.8–19.1)	126.0 (61.0–223.0)	<0.0001
Education, %			0.5613			0.4284
Elementary	7.8	5.7		8.0	5.0
High school	51.2	49.4		50.2	52.2
College	36.7	40.0		38.0	36.5
Graduate and postgraduate	4.3	4.9		3.8	6.3
Poverty‡, %	31.0	33.7	0.4409	30.9	30.6	0.9426
Family history of RA§ %	31.4	38.8	0.0321	29.9	43.1	0.0043
Smoking¶
current %	29.1	24.2	0.1180	28.9	23.4	0.1958
ever %	52.7	55.0	0.5107	52.7	56.3	0.4602
Alcohol¶
current %	16.8	22.5	0.0482	16.7	23.4	0.0791
ever %	65.8	73.2	0.0257	66.7	73.7	0.1184

^*The CLEAR Registry is still actively collecting radiographs at 36 months and 60 months disease duration in CLEAR I and at study entry in CLEAR II. Thus, radiographic scores are not available for all subjects at the present time;

^†p-value calculated by Chi-square or Wilcoxon Rank-sum;

^‡Poverty as per the US Federal government guidelines adjusted for the number of persons in the household;

^§First degree (including mother, father, or sibling);

^¶Any time (Yes or No).