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 | 1.20 (0.80, 1.80) | 1.13 (0.72, 1.77) | 1.15 (0.74, 1.81) | 1.06 (0.65, 1.73) | 0.810 |
Milk beverages | Â | Â | Â | Â | 0.707 |
 Occasionally |  | 0.86 (0.37, 2.02) |  | 0.86 (0.36, 2.04) |  |
 Weekly |  | 1.59 (0.52, 4.87) |  | 1.66 (0.54, 5.12) |  |
 Never |  | 0.50 (0.12, 2.06) |  | 0.47 (0.11, 2.01) |  |
Milk derivatives | Â | Â | Â | Â | 0.302 |
 Occasionally |  | 0.86 (0.28, 2.63) |  | 0.88 (0.28, 2.71) |  |
 Weekly |  | 1.01 (0.28, 2.63) |  | 1.03 (0.28, 2.71) |  |
 never |  | 1..43 (0.38, 5.37) |  | 1.49 (0.39, 5.65) |  |
Yogurt drinks | Â | Â | Â | Â | 0.428 |
 Occasionally |  | 0.94 (0.36, 2.46) |  | 0.93 (0.35, 2.45) |  |
 Weekly |  | 1.76 (0.22, 2.57) |  | 0.76 (0.22, 2.59) |  |
 never |  | 1.61 (0.55, 4.67) |  | 1.58 (0.53, 4.72) |  |
Tea beverages | Â | Â | Â | Â | 0.147 |
 Occasionally |  | 1.21 (0.54, 2.70) |  | 1.22 (0.54, 2.75) |  |
 Weekly |  | 2.43 (0.67, 8.21) |  | 2.46 (0.69, 8.75) |  |
 never |  | 1.91 (0.80, 4.57) |  | 1.80 (0.74, 4.40) |  |
Sweetened soft beverages |  |  |  |  | < 0.0001 |
 Occasionally |  | 0.27 (0.13, 0.55)a |  | 0.27 (0.13, 0.55)a |  |
 Weekly |  | 0.06 (0.01, 0.51) |  | 0.06 (0.01, 0.50)a |  |
 never |  | Empty |  | Empty |  |
Natural fruit juice | Â | Â | Â | Â | 0.73 |
 Occasionally |  | 1.75 (0.46, 6.67) |  | 1.77 (0.47, 6.90) |  |
 Weekly |  | 2.99 (0.69, 12.98) |  | 3.02 (0.69, 13.22) |  |
 never |  | 3.58 (0.86, 14.97) |  | 3.58 (0.85, 15.16) |  |
Other hot beverages | Â | Â | Â | Â | 0.730 |
 Occasionally |  | 1.29 (0.37, 4.49) |  | 1.26 (0.36, 4.43) |  |
 Weekly |  | 1.17 (0.30, 4.55) |  | 1.15 (0.29,4.47) |  |
 never |  | 0.98 (0.29, 3.32) |  | 0.96 (0.28,3.29) |  |
Gender | Â | Â | 0.98 (0.49, 1.97) | 0.97 (0.46, 2.06) | 0.878 |
Tooth brush | Â | Â | 0.87 (0.43, 1.75) | 0.81 (0.37, 1.76) | 0.806 |