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

Table 5 Incidence and incidence rate ratios of visits for oral ulceration and temporomandibular joint disorders in the rheumatoid arthritis cohort and the comparison cohort

Disorder	Age group (years)	Rheumatoid arthritis cohort			Comparison cohort			IRR (95% CI)	aIRR (95% CI)
(ICD-9-CM)	Age group (years)	No. of patient	Person-years	Incidence	No. of patient	Person-years	Incidence	p value	P value
Oral ulceration^a (528.2)
	Overall	222	7057	31.46	1734	70,434	24.62	1.28 (1.11–1.47) 0.001	1.24 (1.08–1.44)0.003
	Sex
	Male	34	1539	22.09	351	15,880	22.10	1.00 (0.70–1.42) 0.999	1.05 (0.73–1.50) 0.804
	Female	188	5518	34.07	1383	54,554	25.35	1.34 (1.15–1.56) < 0.001	1.29 (1.10–1.51) 0.002
	Age group (years)
	20–54	121	4117	29.39	934	41,241	22.65	1.30 (1.07–1.57) 0.007	1.30 (1.06–1.58) 0.011
	> 55	101	2940	34.35	800	29,193	27.40	1.25 (1.02–1.54) 0.032	1.21 (0.98–1.50) 0.083
Temporomandibular joint disorders^b (524.6)
	Overall	18	7697	2.34	117	76,580	1.53	1.53 (0.93–2.51) 0.093	1.31 (0.77–2.23) 0.320
	Sex
	Male	2	1660	1.20	23	17,083	1.35	0.90 (0.21–3.80) 0.881	0.79 (0.18–3.42) 0.750
	Female	16	6037	2.65	94	59,497	1.58	1.68 (0.99–2.85) 0.056	1.33 (0.75–2.36) 0.327
	Age group (years)
	20–54	11	4448	2.47	70	44,502	1.57	1.57 (0.83–2.97) 0.163	1.40 (0.72–2.76) 0.323
	> 55	7	3249	2.15	47	32,078	1.47	1.47 (0.66–3.25) 0.341	1.24 (0.52–2.96) 0.630

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
aIRR, adjusted incidence rate ratio; ICD-9-CM, International Classification of Diseases, Ninth revision, clinical modification; IRR, incidence rate ratio
^aPatients who were diagnosed with oral ulceration within 90 days before the index date were excluded and 1326 patients with rheumatoid arthritis and 13,275 controls were included in the analysis
^bPatients who were diagnosed with temporomandibular joint disorders within 90 days before the index date were excluded and 1302 patients with rheumatoid arthritis and 13,229 controls were included in the analysis

ISSN: 1472-6831