TABLE 5.
RESULTS OF MULTIVARIABLE LOGISTIC REGRESSION OF THE BINARY INDICATOR OF SEVERE/ESTABLISHED PERIODONTAL DISEASE25
| Predictor | Odds Ratio | 95% Wald CI | p-value |
|---|---|---|---|
| Body Mass Index | 1.00 | (0.96, 1.04) | 0.90 |
| Age | 1.01 | (0.98, 1.05) | 0.44 |
| Duration of Diabetes | 0.98 | (0.94, 1.02) | 0.27 |
| Gender (in terms of females) | 0.42 | (0.20, 0.88) | 0.02 |
| Smoking Status | 0.61 | ||
| Current | 0.86 | (0.24, 3.07) | 0.81 |
| Past | 0.44 | (0.08, 2.28) | 0.33 |
| Never | Reference group | ||
| Hemoglobin A1c | 0.69 | ||
| > 8.5% | 1.08 | (0.42, 2.77) | 0.87 |
| 7.0–8.5% | 0.72 | (0.28, 1.86) | 0.49 |
| < 7.0% | Reference group | ||
| Smoking Status by Hemoglobin A1c interaction | 0.39 | ||
| Current, > 8.5% | 2.94 | (0.46, 18.81) | 0.26 |
| Current, 7.0–8.5% | Unable to estimate† | ||
| Current, < 7.0% | Reference group | ||
| Past, > 8.5% | 2.73 | (0.29, 25.89) | 0.38 |
| Past, 7.0–8.5% | 4.74 | (0.53, 42.37) | 0.16 |
| Past, < 7.0% | Reference group | ||
NOTE: N=214.
†
All subjects with hemoglobin A1c levels between 7 and 8.5% who were also current smokers had early periodontitis. Hence this interaction term could not be estimated. Three such subjects were removed from the analysis to ensure a stable model fit.