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Table 4 Incidence and incidence rate ratios of visits for gingivitis and periodontitis in the rheumatoid arthritis cohort and the comparison cohort

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

Disorder

Age group

Rheumatoid arthritis cohort

Comparison cohort

IRR (95% CI)

aIRR (95% CI)

(ICD-9-CM)

(Years)

No. of patient

Person-years

Incidence

No. of patient

Person-years

Incidence

p value

p value

Gingivitisa (523.0, 523.1, 523.2)

 

Overall

419

5938

70.56

3805

60,310

63.09

1.12 (1.01–1.24)

0.030

1.13 (1.01–1.25)

0.027

 

Sex

 

 Male

67

1357

49.37

817

13,499

60.52

0.82 (0.64–1.05)

0.109

0.86 (0.66–1.11)

0.241

 

 Female

352

4581

76.84

2988

46,811

63.83

1.20 (1.08–1.34)

0.001

1.19 (1.06–1.34)

0.003

 

Age group (years)

 

 20–54

269

3258

82.57

2443

33,870

72.13

1.14 (1.01–1.30)

0.036

1.17 (1.02–1.33)

0.022

 

 > 55

150

2680

55.97

1362

26,440

51.51

1.09 (0.92–1.29)

0.334

1.09 (0.92–1.30)

0.330

Periodontitisb

(523.3, 523.4, 523.5, 523.8)

 

Overall

694

4049

171.40

6239

40,686

153.35

1.12 (1.03–1.21)

0.005

1.13 (1.04–1.22)

0.004

 

Sex

 

 Male

144

989

145.60

1381

8943

154.42

0.94 (0.79–1.12)

0.503

1.00 (0.83–1.19)

0.962

 

 Female

550

3060

179.74

4858

31,743

153.04

1.17 (1.08–1.28)

 < 0.001

1.17 (1.07–1.28)

0.001

 

Age group (years)

 

 20–54

405

2207

183.51

3722

22,673

164.16

1.12 (1.01–1.24)

0.033

1.15 (1.03–1.28)

0.013

 

 > 55

289

1842

156.89

2517

18,013

139.73

1.12 (0.99–1.27)

0.063

1.14 (1.00–1.29)

0.043

  1. Adjusted for age, sex, socioeconomic status, geographic region, hypertension, diabetes, congestive heart failure, chronic pulmonary disease, cancer, dyslipidemia, coronary artery disease, prior myocardial infarction, peripheral vascular disease, cerebrovascular disease, dementia, musculoskeletal disorders, peptic ulcer disease, chronic kidney disease, and liver disease
  2. aIRR, adjusted incidence rate ratio; ICD-9-CM, International Classification of Diseases, Ninth revision, clinical modification; IRR, incidence rate ratio
  3. aPatients who were diagnosed with gingivitis within 90 days before the index date were excluded and 1288 patients with rheumatoid arthritis and 13,019 controls were included in the analysis
  4. bPatients who were diagnosed with periodontitis within 90 days before the index date were excluded and 1248 patients with rheumatoid arthritis and 12,152 controls were included in the analysis