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Table 1 Basic characteristics of the rheumatoid arthritis cohort and the comparison cohort (N = 14,707)

From: Increased dental visits in patients with rheumatoid arthritis: a secondary cohort analysis of population based claims data

Variable

N (%)

p value

Rheumatoid arthritis cohort

1337 (9.1)

Comparison cohort

13,370 (90.9)

 

Sex

    

 > 0.999

 Male

302

(22.6)

3020

(22.6)

 

 Female

1035

(77.4)

10,350

(77.4)

 

Age interval at entry (years)

    

 > 0.999

 20–54

721

(53.9)

7210

(53.9)

 

 > 55

616

(46.1)

6160

(46.1)

 

Mean age (standard deviation), years

53.2

(13.4)

53.2

(13.4)

 > 0.999

Median (lower and upper quartile), years

53.0

(44.0, 63.0)

53.0

(44.0, 63.0)

 

Salary grades for insurance (n = 14,689)

    

 < 0.001

 ≤ 19,000

611

(46.0)

7203

(53.9)

 

 19,001–24,000

483

(36.4)

4115

(30.8)

 

 ≥ 24,001

234

(17.6)

2043

(15.3)

 

Geographic region (n = 14,241)

    

0.254

 Northern

748

(58.1)

7880

(60.8)

 

 Central

234

(18.2)

2140

(16.5)

 

 Southern

278

(21.6)

2653

(20.5)

 

 Eastern

28

(2.2)

280

(2.2)

 

Comorbidities

     

 Hypertension

106

(7.9)

1022

(7.6)

0.710

 Diabetes

52

(3.9)

580

(4.3)

0.440

 Congestive heart failure

8

(0.6)

62

(0.5)

0.495

 Chronic pulmonary disease

40

(3.0)

271

(2.0)

0.019

 Cancer

13

(1.0)

235

(1.8)

0.033

 Dyslipidemia

40

(3.0)

327

(2.4)

0.222

 Coronary artery disease

3

(0.2)

46

(0.3)

0.469

 Prior myocardial infarction

1

(0.1)

10

(0.1)

 > 0.999

 Peripheral vascular disease

1

(0.1)

18

(0.1)

0.561

 Cerebrovascular disease

25

(1.9)

230

(1.7)

0.689

 Dementia

1

(0.1)

35

(0.3)

0.187

 Musculoskeletal disordersa

60

(4.5)

50

(0.4)

 < 0.001

 Peptic ulcer disease

68

(5.1)

337

(2.5)

 < 0.001

 Chronic kidney disease

16

(1.2)

114

(0.9)

0.200

 Liver disease

22

(1.6)

174

(1.3)

0.296

  1. Socioeconomic status was estimated by insurance premiums based on salary. Low: < 19,000 New Taiwan dollars (NT$); middle: 19,001–24,000; and high: > 24,000
  2. P values were obtained by Chi-square test for categorical variables and t-test or Mann–Whitney U-test for continuous variables, as appropriate
  3. aExcluding the diagnosis of rheumatoid arthritis (ICD-9 code: 714.0)