Table 2.
The prevalence and frequency of dental disorders in the rheumatoid arthritis and comparison cohort (N = 14,707)
| Variable | N (%) | p value | |||
|---|---|---|---|---|---|
| Rheumatoid arthritis cohort 1337 (9.1) |
Comparison cohort 13,370 (90.9) |
||||
| Dental visits | |||||
| Prevalence (%) | 940 | (70.3) | 8921 | (66.7) | 0.008 |
| Number of visits, median (Q1, Q3) (per year) | 2.67 | (0.0, 14.2) | 1.78 | (0.0, 10.9) | < 0.001 |
| Number of visits, mean (SD) (per year) | 14.25 | (28.87) | 11.79 | (26.56) | |
| Dental caries (ICD-9-CM 521.0) | |||||
| Prevalence (%) | 747 | (55.9) | 6885 | (51.5) | 0.002 |
| Number of visits, median (Q1, Q3) (per year) | 0.55 | (0.0, 4.6) | 0.20 | (0.0, 3.4) | < 0.001 |
| Number of visits, mean (SD) (per year) | 4.76 | (9.89) | 4.07 | (9.67) | |
| Pulpitis (ICD-9-CM 522.0) | |||||
| Prevalence (%) | 421 | (31.5) | 3755 | (28.1) | 0.009 |
| Number of visits, median (Q1, Q3) (per year) | 0.00 | (0.0, 0.8) | 0.00 | (0.0, 0.4) | 0.002 |
| Number of visits, mean (SD) (per year) | 1.45 | (4.15) | 1.17 | (3.61) | |
| Gingivitis (ICD-9-CM 523.0, 523.1, 523.2) | |||||
| Prevalence (%) | 449 | (33.6) | 4005 | (30.0) | 0.006 |
| Number of visits, median (Q1, Q3) (per year) | 0.00 | (0.0, 0.9) | 0.00 | (0.0, 0.5) | 0.001 |
| Number of visits, mean (SD) (per year) | 1.45 | (4.32) | 1.11 | (3.64) | |
| Periodontitis (ICD-9-CM 523.3, 523.4, 523.5, 523.8) | |||||
| Prevalence (%) | 762 | (57.0) | 7172 | (53.6) | 0.019 |
| Number of visits, median (Q1, Q3) (per year) | 0.59 | (0.0, 3.7) | 0.28 | (0.0, 3.1) | 0.001 |
| Number of visits, mean (SD) (per year) | 4.46 | (10.53) | 3.85 | (9.91) | |
| Oral ulceration (ICD-9-CM 528.2) | |||||
| Prevalence (%) | 229 | (17.1) | 1775 | (13.3) | < 0.001 |
| Number of visits, median (Q1, Q3) (per year) | 0.00 | (0.0, 0.0) | 0.00 | (0.0, 0.0) | < 0.001 |
| Number of visits, mean (SD) (per year) | 0.80 | (4.40) | 0.52 | (2.83) | |
| Stomatitis (ICD-9-CM 528.0) | |||||
| Prevalence (%) | 124 | (9.3) | 1108 | (8.3) | 0.214 |
| Number of visits, median (Q1, Q3) (per year) | 0.00 | (0.0, 0.0) | 0.00 | (0.0, 0.0) | 0.197 |
| Number of visits, mean (SD) (per year) | 0.39 | (2.01) | 0.31 | (2.41) | |
| Temporomandibular joint disorders (ICD-9-CM 524.6) | |||||
| Prevalence (%) | 21 | (1.6) | 137 | (1.0) | 0.065 |
| Number of visits, median (Q1, Q3) (per year) | 0.00 | (0.0, 0.0) | 0.00 | (0.0, 0.0) | 0.065 |
| Number of visits, mean (SD) (per year) | 0.04 | (0.46) | 0.03 | (0.46) | |
P values were obtained by Chi-square test for comparison of prevalence and Mann–Whitney U-test for comparison of medians of number of visits
ICD-9-CM, International Classification of Diseases, Ninth revision, clinical modification; Q1, lower quartile; Q3, upper quartile; SD, standard deviation