Table 3.

The relationship between the mean DFT/DFRoot of caries and alcohol consumption (results of the negative binomial regression analyses)

	DFT			DFRoot
	IRR (95% CI) ※	Adjusted IRR (95% CI)	P-value	IRR (95% CI) ※	Adjusted IRR (95% CI)	P-value
Alcohol consumption
Never/ rarely	ref.	ref.		ref.	ref.
Sometimes	0.89 (0.72, 1.10)	1.06 (0.83, 1.35)	0.646	0.93 (0.70, 1.24)	1.18 (0.87, 1.61)	0.287
Often	0.50 (0.35, 0.70)	0.63 (0.44, 0.92)	0.015	0.43 (0.27, 0.68)	0.52 (0.32, 0.84)	0.008
Sex
Male	ref.	ref.		ref.	ref.
Female	1.36 (1.14, 1.61)	1.07 (0.85, 1.35)	0.550	1.14 (0.91, 1.43)	0.83 (0.62, 1.12)	0.232
Age
55–64 years	ref.	ref.		ref.	ref.
65–74 years	1.17 (0.99, 1.39)	1.04 (0.87, 1.25)	0.650	1.29 (1.03, 1.61)	1.02 (0.80, 1.29)	0.874
Residence
Urban	ref.	ref.		ref.	ref.
Rural	1.03 (0.86, 1.22)	1.11 (0.90, 1.38)	0.341	1.49 (1.19, 1.86)	1.59 (1.20, 2.10)	0.001
Education level
≤ 6 years	ref.	ref.		ref.	ref.
> 6, ≤9 years	0.83 (0.68, 1.02)	0.91 (0.72, 1.15)	0.417	0.73 (0.55, 0.95)	0.78 (0.57, 1.05)	0.104
> 9 years	0.65 (0.51, 0.81)	0.66 (0.51, 0.86)	0.002	0.47 (0.34, 0.64)	0.50 (0.35, 0.71)	< 0.001
Sweet consumption
Never/ rarely	ref.	ref.		ref.	ref.
Often	1.17 (0.95, 1.44)	1.30 (1.04, 1.63)	0.023	1.10 (0.83, 1.45)	1.32 (1.14, 2.06)	0.005
Smoking status
Never smoked	ref.	ref.		ref.	ref.
≤ 10 /day	0.76 (0.54, 1.05)	0.82 (0.57, 1.18)	0.281	0.95 (0.62, 1.46)	0.90 (0.57, 1.42)	0.643
> 10 /day	0.64 (0.51, 0.80)	0.72 (0.54, 0.96)	0.027	0.74 (0.55, 0.99)	0.71 (0.49, 1.03)	0.070
Household income
Low	ref.	ref.		ref.	ref.
Medium	0.92 (0.73, 1.16)	0.93 (0.74, 1.18)	0.561	0.81 (0.60, 1.09)	0.86 (0.64, 1.15)	0.307
High	0.99 (0.75, 1.31)	1.06 (0.78, 1.44)	0.700	0.70 (0.49, 1.01)	0.97 (0.66, 1.44)	0.883

※: IRR, incidence rate ratio