Table 4. Interaction effects between TB, DF, IPB use, and MR use on higher CPI across age groups (n=1,911).
| Variables | ORs (95% CI) | |||
|---|---|---|---|---|
| Total | 19–39 years | 40–59 years | 60+ years | |
| TB none or once only | 1 | 1 | 1 | 1 |
| TB twice only | 0.98 (0.62–1.54) | 1.01 (0.09–4.62) | 1.02 (0.45–2.23) | 1.15 (0.68–1.94) |
| DF with TB twice | 0.32 (0.17–0.57) | 0.53 (0.04–3.15) | 0.43 (0.26–1.16) | 0.53 (0.34–0.89) |
| DF and IPB with TB twice | 0.45 (0.22–0.93) | 0.59 (0.23–0.81) | 0.57 (0.38–0.82) | 0.55 (0.35–0.86) |
| DF and MR with TB twice | 0.37 (0.19–0.71) | 0.27 (0.01–5.11) | 0.56 (0.31–0.90) | 0.41 (0.26–0.83) |
| DF, IPB and MR with TB twice | 0.47 (0.22–0.99) | 0.13 (0.01–0.65) | 0.45 (0.26–0.79) | 0.65 (0.19–2.23) |
| IPB with TB twice | 0.66 (0.40–1.09) | 0.16 (0.01–2.54) | 1.00 (0.41–2.45) | 0.68 (0.36–1.28) |
| IPB and MR with TB twice | 0.82 (0.45–1.51) | 1.53 (0.10–4.93) | 0.87 (0.32–2.33) | 1.14 (0.51–2.52) |
| MR with TB twice | 0.99 (0.61–1.62) | 1.62 (0.14–3.68) | 1.25 (0.54–2.91) | 0.75 (0.41–1.36) |
Bold denotes statistical significance.
TB: tooth brushing, DF: dental floss, IPB: interproximal brush, MR: mouth rinse, CPI: Community Periodontal Index, OR: odds ratio, CI: confidence interval.