Table 4.

Factors associated with PCS scores (linear regression model).

Model	Variable	Unstandardized coefficient	SE	Standardized coefficient	p-value	Collinearity statistics
						Tolerance	VIF
3 months
A	Intervention	−3.31	1.47	−0.19	0.027	1.00	1.00
	PCS baseline	0.53	0.10	0.45	<0.001	0.93	1.08
	GOHAI baseline	0.34	0.12	0.24	0.007	0.93	1.07
B	Intervention	−3.63	1.49	−0.21	0.017	0.99	1.01
	PCS baseline	0.56	0.10	0.48	<0.001	0.96	1.04
	OHIP baseline	−0.26	0.11	−0.21	0.018	0.96	1.04
6 months
A	Intervention	−3.92	1.80	−0.21	0.032	1.00	1.00
	GOHAI baseline	0.39	0.15	0.26	0.011	0.93	1.07
	PCS baseline	0.29	0.13	0.23	0.025	0.93	1.08
B	Intervention	−4.35	1.80	−0.23	0.018	0.99	1.01
	OHIP-14 baseline	−0.34	0.13	−0.26	0.010	0.96	1.04
	PCS baseline	0.31	0.12	0.24	0.014	0.96	1.04

3-month final model: adjusted RP Psquare (model 3^a) = 0.33; adjusted R square (model 3^b) = 0.31. 6-month final model: adjusted RP Psquare (model 3^a) = 0.16; adjusted R square (model 3^b) = 0.16.