Table 2.
Outcomes of multivariate modelling, and smoking-plaque effect modification, for proband prevalence of one or more sites with 4+mm combined attachment loss (CAL), prevalence of two or more sites with 4+mm CAL, and prevalence of one or more sites with 5+mm CAL at age 32, and prevalence of one or more sites with 3+mm incident CAL between age 26 and age 32.
| High familial-risk group for periodontal disease | ||||
|---|---|---|---|---|
| Unadjusted | Adjusted Model 1a |
Adjusted Model 2b |
Adjusted Model 3c |
|
| Periodontal disease prevalence at 32 | ||||
| One or both parents sample | ||||
| RR 1+ sites with 4+mm CAL (95% CI) | 1.33 (1.05,1.69) | 1.32 (1.05,1.67) | 1.24 (0.98,1.55) | 1.23 (0.98,1.54) |
| RR 2+ sites with 4+mm CAL (95% CI) | 1.32 (0.96,1.80) | 1.31 (0.96,1.78) | 1.20 (0.89,1.63) | 1.18 (0.88,1.57) |
| RR 1+ sites with 5+mm CAL (95% CI) | 1.59 (1.06,2.38) | 1.57 (1.05,2.33) | 1.40 (0.94,2.09) | 1.36 (0.92,1.99) |
| RR 1+ sites with 3+mm incident CAL (95% CI) | 1.47 (0.97,2.21) | 1.45 (0.97,2.18) | 1.35 (0.90,2.04) | 1.34 (0.90,2.01) |
| Both parents sample | ||||
| RR 1+ sites with 4+mm CAL (95% CI) | 1.57 (1.19,2.08) | 1.55 (1.19,2.03) | 1.46 (1.12,1.89) | 1.45 (1.11,1.88) |
| RR 2+ sites with 4+mm CAL (95% CI) | 1.65 (1.14,2.40) | 1.62 (1.12,2.33) | 1.51 (1.07,2.12) | 1.45 (1.03,2.05) |
| RR 1+ sites with 5+mm CAL (95% CI) | 1.93 (1.19,3.11) | 1.88 (1.18,2.99) | 1.64 (1.04,2.59) | 1.60 (1.02,2.50) |
| RR 1+ sites with 3+mm incident CAL (95% CI) | 1.79 (1.10,2.92) | 1.75 (1.08,2.83) | 1.65 (1.01,2.69) | 1.64 (1.01,2.66) |
Model 1 adjusted for sex and SES.
Model 2 adjusted for sex, SES, use of dental services, plaque trajectory, and pack years to age 32 (smoking history).
Model 3 adjusted for sex, SES, use of dental services, and interaction between smoking and plaque trajectory.
Reference categories: male (female, coded 0), medium or low SES at age 32 (high SES coded 0), episodic user of dental services at age 32 (routine user of dental services at age 32, coded 0), moderate or high plaque trajectory (low plaque trajectory coded 0), non-smoker at age 32 + moderate plaque trajectory, non-smoker at age 32 + high plaque trajectory, smoker at age 32 + low plaque trajectory, smoker at age 32 + moderate plaque trajectory or smoker at age 32 + high plaque trajectory (non-smoker at age 32 + low plaque trajectory coded 0), high familial-risk for periodontal disease (low familial-risk for periodontal disease coded 0)
RR, relative risk; CAL, combined attachment loss; CI, confidence interval; SES, socioeconomic status. Significant findings in bold type.