Table 3.

Modeling DMFT based on Negative Binomial regression model^b

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					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					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					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					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					0.127
Occasionally		0.85 (0.73, 0.99)a		0. 85 (0.74, 1.0)
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					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					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			0.99 (0.86, 1.14)	0.96 (0.83, 1.10)	0.727
Tooth brush			1.11 (0.96, 1.28)	1.10 (0.95, 1.28)	0.094

^aStatistically significant

^bDaily consumption was used as reference variable

^cModel 1 was adjusted for plaque index

^dModel 2 was adjusted for plaque index and 7 groups of beverage

^eModel 3 was adjusted for plaque index, tooth brushing status and gender

^fModel 4 was adjusted for all variables