Table 5.

Multivariate linear regression based on the backward selection method for prediction of domain scores of the Chinese version of the 14-item Oral Health Impact Profile (OHIP-C14) (n = 515)

Variables	Unstandardised coefficients B (standard error)	Standardised coefficients Beta	P value	R2
Dependent variable: OHIP-functional limitation
AB	0.49 (0.20)	0.112	0.013	0.026
SB	0.44 (0.21)	0.093	0.038
Dependent variables: OHIP-physical pain
AB	0.74 (0.25)	0.130	0.003	0.017
Dependent variables: OHIP-psychological discomfort
AB	1.28 (0.24)	0.227	<0.001	0.065
CSP	0.51 (0.22)	0.101	0.018
Dependent variables: OHIP-physical disability
AB	0.91 (0.25)	0.161	<0.001	0.026
Dependent variables: OHIP-psychological disability
AB	0.97 (0.23)	0.189	<0.001	0.058
SB	0.42 (0.24)	0.077	0.082
CSP	0.41 (0.20)	0.090	0.038
Dependent variables: OHIP-social disability
AB	0.81 (0.20)	0.172	<0.001	0.039
CSP	0.37 (0.18)	0.089	0.041
Dependent variables: OHIP-handicap
AB	0.64 (0.21)	0.131	0.003	0.024
CSP	0.32 (0.19)	0.074	0.090

AB, awake bruxism; CSP, chewing-side preference; SB, sleep bruxism.