Table 4.
Logistic regression analysis with severe periodontitis as dependent variable.
| Variables * | Categories | ORcrd | 95%CI | P value † | ORadj ‡ | 95%CI | P value † |
|---|---|---|---|---|---|---|---|
| Age, years | <65 | 1 | 1 | ||||
| ≥65 | 1.57 | 0.95, 2.62 | 0.080 | 1.45 | 0.80, 2.62 | 0.218 | |
| Presence of hypertension | No | 1 | 1 | ||||
| Yes | 1.70 | 1.02, 2.84 | 0.044 | 1.46 | 0.82, 2.59 | 0.196 | |
| Smoking | Never | 1 | 1 | ||||
| Former | 1.61 | 0.74, 3.49 | 0.232 | 1.35 | 0.57, 3.19 | 0.501 | |
| Current | 3.44 | 1.12, 10.55 | 0.031 | 3.98 | 1.11, 14.29 | 0.034 | |
| Alcohol consumption | Never/former | 1 | 1 | ||||
| Current | 1.40 | 0.85, 2.30 | 0.175 | 1.45 | 0.82, 2.57 | 0.202 | |
| Vegetable consumption | ≤3–4 times/week | 1 | 1 | ||||
| Every day | 0.56 | 0.35, 0.90 | 0.018 | 0.59 | 0.34, 1.00 | 0.050 | |
| Coffee consumption | <1 cup/day | 1 | 1 | ||||
| ≥1 cup/day | 0.54 | 0.34, 0.87 | 0.012 | 0.55 | 0.32, 0.92 | 0.023 | |
| Coffee consumed with sugar | Yes | 1 | 1 | ||||
| No/others/unknown | 0.63 | 0.38, 1.06 | 0.081 | 0.69 | 0.39, 1.22 | 0.200 | |
| Number of teeth present | 0.93 | 0.89, 0.97 | 0.001 | 0.95 | 0.90, 0.99 | 0.027 | |
| BOP (%) | <20 | 1 | 1 | ||||
| ≥20 | 4.13 | 2.30, 7.41 | <0.001 | 3.67 | 1.96, 6.86 | <0.001 |
ORcrd, unadjusted odds ratio; ORadj, adjusted odds ratio; CI, confidence interval; BOP, bleeding on probing. P values were considered statistically significant if less than 0.05. * Variables were selected according to P value less than 0.20 with the chi-square test or unpaired t-test in Table 2 and considering previous studies; † Wald test; ‡ Odds ratio adjusted by age, hypertension, smoking, alcohol consumption, vegetable consumption, coffee consumption, coffee consumed with sugar, number of teeth present, and BOP. According to the Hosmer and Lemeshow test, chi-square statistic was 6.599 (p = 0.580).