Table 3 Incidence and incidence rate ratios of visits for dental caries and pulpitis in the rheumatoid arthritis cohort and the comparison cohort
Disorder | 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 |
Dental cariesa (521.0) | |||||||||
Overall | 683 | 4009 | 170.37 | 6085 | 41,693 | 145.95 | 1.17 (1.08–1.26) < 0.001 | 1.16 (1.07–1.26) < 0.001 | |
Sex | |||||||||
Male | 125 | 1019 | 122.67 | 1275 | 9768 | 130.53 | 0.94 (0.78–1.13) 0.508 | 0.98 (0.81–1.18) 0.804 | |
Female | 558 | 2990 | 186.62 | 4810 | 31,925 | 150.67 | 1.24 (1.14–1.35) < 0.001 | 1.21 (1.11–1.33) < 0.001 | |
Age group (years) | |||||||||
20–54 | 414 | 2112 | 196.02 | 3736 | 22,448 | 166.43 | 1.18 (1.06–1.30) 0.002 | 1.18 (1.06–1.31) 0.002 | |
> 55 | 269 | 1897 | 141.80 | 2349 | 19,245 | 122.06 | 1.16 (1.02–1.32) 0.020 | 1.18 (1.03–1.34) 0.014 | |
Pulpitisb (522.0) | |||||||||
Overall | 405 | 5885 | 68.82 | 3608 | 58,912 | 61.24 | 1.12 (1.01–1.24) 0.026 | 1.12 (1.00–1.24) 0.044 | |
Sex | |||||||||
Male | 65 | 1386 | 46.90 | 738 | 13,553 | 54.45 | 0.86 (0.67–1.11) 0.249 | 0.89 (0.68–1.15) 0.368 | |
Female | 340 | 4499 | 75.57 | 2870 | 45,359 | 63.27 | 1.19 (1.07–1.34) 0.002 | 1.18 (1.05–1.32) 0.006 | |
Age group (years) | |||||||||
20–54 | 242 | 3291 | 73.53 | 2207 | 33,505 | 65.87 | 1.12 (0.98–1.28) 0.104 | 1.11 (0.96–1.27) 0.157 | |
> 55 | 163 | 2594 | 62.84 | 1401 | 25,407 | 55.14 | 1.14 (0.97–1.34) 0.115 | 1.15 (0.97–1.36) 0.105 | |