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. Author manuscript; available in PMC: 2011 May 1.
Published in final edited form as: Arthritis Care Res (Hoboken). 2010 May;62(5):624–631. doi: 10.1002/acr.20040

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).