eTable 2.
Predictors of exposed bone within 2 years after radiation therapy, including the category of missing.*
| COMPARISON | UNADJUSTED† | ADJUSTED‡ | ||||
|---|---|---|---|---|---|---|
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|
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| Relative Risk | 95% CI | P Value | Relative Risk | 95% CI | P Value | |
| Retained Hopeless Teeth vs Missing Pre-RT § | 11.8 | 2.9 to 47.0 | .0005 | 18.7 | 4.0 to 88.1 | .0002 |
| Extracted Pre-RT vs Missing Pre-RT | 4.0 | 1.1 to 14.2 | .031 | 2.9 | 0.83 to 10.5 | .096 |
| Retained Hopeless Teeth vs Extracted Pre-RT | 2.9 | 0.6 to 13.9 | .17 | 6.4 | 1.2 to 35.2 | .034 |
| Untreated Caries vs Teeth Without Caries | 1.2 | 0.3 to 4.8 | .78 | 1.2 | 0.4 to 3.8 | .81 |
| Deepest Periodontal Pocket, mm | ||||||
| ≥ 6 vs < 4 | 3.5 | 0.6 to 19.6 | .15 | 5.4 | 1.8 to 16.0 | .003 |
| 5 vs < 4 | 2.8 | 0.8 to 10.2 | .13 | 4.7 | 1.3 to 16.4 | .016 |
| 4 vs 4 | 1.4 | 0.5 to 4.2 | .51 | 2.2 | 0.7 to 6.5 | .17 |
| Missing¶ | 3.7 | 1.5 to 9.1 | .005 | 4.1 | 1.6 to 10.3 | .003 |
| Furcation Score | ||||||
| 2 vs 0 | 1.4 | 0.4 to 5.3 | .60 | 1.4 | 0.3 to 5.6 | .66 |
| 1 vs 0 | 0.3 | 0.1 to 1.0 | .056 | 0.3 | 0.1 to 1.1 | .063 |
| Missing¶ | 1.2 | 0.5 to 3.0 | .73 | 0.8 | 0.3 to 2.1 | .71 |
| Gingival Recession, Cementoenamel Junction to Gingival Margin Distance, mm | ||||||
| < −2 vs ≥ 0 | 0.9 | 0.3 to 2.5 | .87 | 1.1 | 0.4 to 2.7 | .91 |
| −1 or −2 vs ≥ 0 | 1.6 | 0.5 to 5.7 | .46 | 2.4 | 0.6 to 9.5 | .20 |
| Missing¶ | 2.7 | 1.1 to 6.6 | .034 | 2.6 | 1.01 to 6.9 | .047 |
| Mobility | ||||||
| Any grade vs none | 4.5 | 1.1 to 18.2 | .032 | 3.7 | 0.9 to 15.3 | .071 |
| Missing¶ | 2.5 | 1.1 to 5.9 | .033 | 2.1 | 0.9 to 5.1 | .091 |
| Bleeding on Probing | ||||||
| Yes vs no | 0.7 | 0.3 to 1.6 | .42 | 0.7 | 0.3 to 1.6 | .39 |
| Missing¶ | 2.4 | 1.01 to 5.7 | .048 | 2.1 | 0.9 to 5.1 | .094 |
This version of Table 3 includes results for the category of missing, when one was included for a comparison. In this table, the relative risks for a given predictor are relative to the predictor’s reference group, which is different for each predictor, so the missing category is not expected to have the same relative risk for the different predictors.
These analyses include the same participants and teeth included in the adjusted analyses. The adjusters had little missing data; unadjusted analyses including all participants and teeth (that is, that have the data needed for the unadjusted analysis) give nearly identical results.
Adjustments are the same as in the version of Table 3 included in the main article.
RT: Radiation therapy.
The analysis included a category capturing teeth for which the predictor was missing. The missing category does not include third molars, for which Observational Study of Dental Outcomes in Head and Neck Cancer Patients did not measure periodontal data, and it does not include study participants who did not have periodontal measures obtained because antibiotic prophylaxis would have been necessary. Teeth labeled missing were almost entirely missing non–third-molar teeth in people who otherwise had periodontal measurements obtained, with the few exceptions being teeth that were present but for which pocket depth or free gingival margin to cementoenamael junction distance could not be measured for any of the 6 sites on the tooth.