Parameter and confounders | Model 1c IRR (95% CI) | Model 2d IRR (95% CI) | Model 3e IRR (95% CI) | Model 4f IRR (95% CI) | P-value |
---|---|---|---|---|---|
Plaque index | 1.23 (1.13, 1.34)a | 1.23 (1.13, 1.34)a | 1.27 (1.15, 1.39)a | 1.25 (1.14, 1.37)a | < 0.001 |
Milk beverages | Â | Â | Â | Â | 0.006 |
 Occasionally |  | 1.10 (0.94, 1.30) |  | 1.11 (0.95, 1.31) |  |
 Weekly |  | 1.38 (1.09, 1.74)a |  | 1.38 (1.09, 1.74)a |  |
 Never |  | 1.31 (1.03, 1.67)a |  | 1.34 (1.05, 1.71)a |  |
Milk derivatives | Â | Â | Â | Â | 0.760 |
 Occasionally |  | 0.93 (0.74, 1.18) |  | 0.93 (0.73, 1.17) |  |
 Weekly |  | 0.92 (0.70, 1.20) |  | 0.92 (0.70, 1.20) |  |
 Never |  | 0.94 (0.71, 1.23) |  | 0.94 (0.72, 1.24) |  |
Yogurt drinks | Â | Â | Â | Â | 0.121 |
 Occasionally |  | 1.08 (0.90, 1.30) |  | 1.08 (0.90, 1.30) |  |
 Weekly |  | 1.14 (0.91, 1.42) |  | 1.13 (0.91, 1.41) |  |
 Never |  | 1.15 (0.91, 1.45) |  | 1.15 (0.91, 1.45) |  |
Tea beverages | Â | Â | Â | Â | 0.759 |
 Occasionally |  | 1.04 (0.90, 1.20) |  | 1.03 (0.90, 1.19) |  |
 Weekly |  | 1.14 (0.87, 1.50) |  | 1.12 (0.85, 1.48) |  |
 Never |  | 0.96 (0.80, 1.14) |  | 0.97 (0.81, 1.16) |  |
Sweetened soft beverages | Â | Â | Â | Â | 0.127 |
Occasionally | Â | 0.85 (0.73, 0.99)a | Â | 0. 85 (0.74, 1.0) | Â |
 Weekly |  | 0.90 (0.71,1.15) |  | 0.91 (0.71, 1.15) |  |
 Never |  | 0.61 (0.37,0.99)a |  | 0.64 (0.39, 1.06) |  |
Natural fruit juice | Â | Â | Â | Â | 0.505 |
 Occasionally |  | 1.21 (0.96, 1.53) |  | 1.21 (0.96, 1.53) |  |
 Weekly |  | 1.27 (0.97, 1.67) |  | 1.27 (0.97, 1.66) |  |
 Never |  | 1.01 (0.77, 1.31) |  | 1.00 (0.76, 1.31) |  |
Other hot beverages | Â | Â | Â | Â | 0.882 |
 Occasionally |  | 1.03 (0.80, 1.33) |  | 1.02 (0.79, 1.32) |  |
 Weekly |  | 0.95 (0.72, 1.25) |  | 0.95 (0.72, 1.25) |  |
 Never |  | 1.04 (0.81, 1.33) |  | 1.03 (0.80, 1.32) |  |
Gender | Â | Â | 0.99 (0.86, 1.14) | 0.96 (0.83, 1.10) | 0.727 |
Tooth brush | Â | Â | 1.11 (0.96, 1.28) | 1.10 (0.95, 1.28) | 0.094 |