Table 1

Characteristics of 509 subjects from the MCBS (2001 to 2006) included in the rheumatoid arthritis cohort

N (%) or median (IQR)


Age at beginning of index round, years

70.1 (IQR 68.0 to 74.9)

Female

366 (71.9%)

Race/ethnicity

Non-Hispanic, white

389 (76.4%)

Non-Hispanic, black

58 (11.4%)

Hispanic

44 (8.6%)

Non-Hispanic, Other

18 (3.5%)

Region (at index round)

Northeast

108 (21.2%)

Midwest

120 (23.6%)

South

176 (34.6%)

West

96 (18.9%)

Missing

9 (1.8%)

Years of education at index round

≤ high school

343 (67.4%)

Beyond high school

166 (32.6%)

Annual income (US dollars)

>50,000

26 (5.1%)

>30,000 to 50,000

103 (20.2%)

>20,000 to 30,000

110 (21.6%)

>15,000 to 20,000

64 (12.6%)

≤ 15,000

187 (36.7%)

Missing

19 (3.7%)

Rheumatology visit during prior year

120 (23.6%)

Number of comorbid conditions during index round

0 comorbid conditions

19 (3.7%)

1 comorbid condition

183 (36.0%)

2+ comorbid conditions

307 (60.3%)

Insurance status

Private insurance

315 (61.9%)

Managed care

55 (10.8%)

Drug insurance

382 (75.1%)


All variables were measured at the survey round when individuals entered the rheumatoid arthritis study cohort. MCBS, Medicare Current Beneficiary Survey; IQR, interquartile range.

Solomon et al. Arthritis Research & Therapy 2013 15:R43   doi:10.1186/ar4201

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