Table 3. Multivariable Adjusted Linear Regression Model Coefficients for Mini-Mental State Examination Scores with Total Number of Functional Tooth Units and Covariates.

	Model 1		Model 2		Model 3		Model 4
Characteristic	B (95% CI)	P-Value	B (95% CI)	P-Value	B (95% CI)	P-Value	B (95% CI)	P-Value
Age (reference ≤84 years)
85–89 years	1.04 (-2.30–4.38)	.54	1.31 (-1.97–4.59)	.43	1.46 (-1.62–4.54)	.35	1.86 (-1.16–4.88)	.23
90–94 years	-0.11 (-3.34–3.11)	.94	0.61 (-2.58–3.79)	.71	0.88 (-2.12–3.87)	.56	1.21 (-1.73–4.15)	.42
≥95 years	-1.17 (-4.75–2.41)	.52	-0.39 (-3.93–3.14)	.83	0.18 (-3.11–3.47)	.91	0.40 (-2.82–3.61)	.81
Male	0.74 (-2.15–3.63)	.62	-0.04 (-3.13–3.06)	.98	0.73 (-2.18–3.64)	.62	0.84 (-2.00–3.67)	.56
Longest job (reference blue-collar worker)
White-collar worker			4.47 (1.64–7.31)	.002	4.11 (1.46–6.75)	.003	4.29 (1.71–6.88)	.001
The others including the unemployed			1.28 (-1.67–4.22)	.39	0.25 (-2.55–3.05)	.86	0.80 (-1.95–3.55)	.57
Never drinker			-3.69 (-7.70–0.31)	.07	-4.00 (-7.76–0.24)	.04	-3.67 (-7.36–0.03)	.05
Charlson comorbidity index (reference ≥2)
0					6.39 (2.10–10.67)	.004	6.05 (1.87–10.23)	.005
1					-0.41 (-3.11–2.30)	.77	-0.55 (-3.19–2.10)	.68
Barthel Index >60					6.45 (3.43–9.46)	< .001	4.74 (1.51–7.96)	.004
Mini Nutritional Assessment Short Form (reference at risk of malnutrition)
Malnutrition							-4.49 (-7.49–1.49)	.004
Well nourished							2.59 (-0.74–5.93)	.13
Number of natural teeth (reference 0 teeth)
1–9 teeth	-2.06 (-4.90–0.77)	.15	-2.25 (-5.07–0.56)	.12	-1.84 (-4.52–0.84)	.18	-1.64 (-4.26–0.98)	.22
10–19 teeth	2.73 (-1.23–6.70)	.18	3.25 (-0.64–7.13)	.10	2.58 (-1.09–6.25)	.17	3.00 (-0.59–6.59)	.10
≥20 teeth	-1.50 (-5.58–2.57)	.47	-1.80 (-5.79–2.18)	.37	-2.84 (-6.58–0.90)	.14	-3.27 (-6.93–0.39)	.08
Total number of functional tooth units	0.48 (0.22–0.74)	< .001	0.47 (0.21–0.72)	< .001	0.36 (0.11–0.60)	.004	0.25 (0.01–0.49)	.04

CI = confidence interval. Denture use not included in the multivariate model because of multicollinearity.