Table 1

Characteristics of Medicare diabetes patients with and without RA (N = 256,331)

Characteristic

DM + RA

(n = 5,572)

DM no RA (n = 250,759)

P-value


Sociodemographics, n (%)

Age

65 to 74 years

3,056 (54.9)

136,288 (54.4)

0.47

75 to 84 years

2,124 (38.1)

95,540 (38.1)

1

85+ years

392 (7.0)

18,931 (7.6)

0.16

Female

4,164 (74.7)

151,846 (60.6)

<0.01

Race/ethnicity

White

4,318 (77.5)

207,565 (82.8)

<0.01

Black

716 (12.9)

26,495 (10.6)

<0.01

Other

538 (9.7)

16,699 (6.7)

<0.01

Medicaid

1,480 (26.6)

46,944 (18.7)

<0.01

RUCA category

Urban

3,936 (71.8)

164,742 (66.4)

<0.01

Suburban

407 (7.4)

23,007 (9.3)

<0.01

Large town

554 (10.1)

31,229 (12.6)

<0.01

Small town

586 (10.7)

29,033 (11.7)

<0.01

Baseline cardiovascular profile, n (%)

Myocardial infarction

266 (4.8)

11,146 (4.4)

0.24

Ischemic heart disease

3,237 (58.0)

126,690 (50.5)

<0.01

Congestive heart failure

2,063 (37.0)

73,057 (29.1)

<0.01

Stroke/Transient ischemic attack

793 (14.2)

31,971 (12.8)

<0.01

Hyperlipidemia

4,151 (74.5)

190,713 (76.1)

<0.01

Baseline diabetes complication profile, n (%)

Peripheral vascular disease

2,410 (43.3)

82,440 (32.9)

<0.01

Chronic kidney disease

952 (17.1)

35,984 (14.4)

<0.01

Lower extremity ulcers

703 (12.6)

17,815 (7.1)

<0.01

Amputation

50 (0.9)

1,587 (0.6)

<0.05

Diabetic eye disease

765 (13.7)

40,417 (16.1)

<0.01

Other comorbidity and baseline utilization measures

Orthopedic surgery, n (%)

1,452 (26.1)

32,121 (12.8)

<0.01

Gait device, n (%)

492 (8.8)

12,768 (5.1)

<0.01

HCC score, mean (SD)

1.55 (1.04)

0.82 (0.80)

<0.01

Hospitalization 2004 to 2006, n (%)

3,379 (60.6)

125,168 (49.9)

<0.01

Total unique providers, three-year mean (SD)

8.8 (5.7)

6.3 (4.0)

<0.01

Total outpatient visits, annual mean (SD)

14.7 (9.3)

9.6 (6.7)

<0.01

PCP visits, annual mean (SD)

7.0 (5.9)

5.3 (4.0)

<0.01

Rheumatology visits, annual mean (SD)

2.0 (3.1)

0.1 (0.5)

<0.01

Other specialty visits, annual mean (SD)

5.6 (5.8)

4.1 (4.7)

<0.01


DM, Diabetes mellitus; HCC, Hierarchical Condition Categories; PCP, Primary care provider; RA, Rheumatoid arthritis; RUCA, Rural Urban Commuting Area; SD, Standard deviation

Bartels et al. Arthritis Research & Therapy 2012 14:R166   doi:10.1186/ar3915

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