Table 6.

Stratified analyses between the cross sectional area of the masseter muscle and the PAS, FOIS, and OPSE scores after surgery.

	N	PAS			FOIS			OPSE
		Beta	95% CI	P-value	Beta	95% CI	P-value	Beta	95% CI	P-value
Age
< 65 years	19	− 0.03	− 1.63 to 1.68	0.967	0.34	− 1.03 to 1.72	0.599	15.08	− 5.76 to 35.91	0.144
≧ 65 years	26	− 0.38	− 1.37 to 0.64	0.458	0.55	− 0.12 to 1.23	0.104	15.25	2.79–27.71	0.019
Surgical lesions
Larynx and hypopharynx	24	− 0.35	− 1.71 to 1.00	0.592	0.42	− 0.52 to 1.38	0.361	16.47	− 2.29 to 35.24	0.081
Oropharynx	13	− 0.29	− 1.61 to 1.02	0.634	0.68	− 0.31 to 1.69	0.157	21.61	9.67–33.56	0.002
Others	8	− 0.28	− 2.41 to 1.85	0.748	0.46	− 1.51 to 2.45	0.57	23.42	3.82–43.02	0.027
Surgical procedures
With reconstruction	23	0.01	− 1.02 to 10.58	0.971	0.75	− 0.14 to 1.65	0.097	10.25	− 6.31 to 26.82	0.210
Without reconstruction	22	− 0.29	− 1.51 to 0.91	0.612	0.26	− 0.56 to 1.09	0.516	15.73	4.41–27.05	0.009
Irradiation field
Bilateral neck irradiation	28	− 0.00	− 0.09 to 0.98	0.998	0.53	− 0.19 to 1.26	0.145	13.05	0.62–25.48	0.04
Unilateral or no neck irradiation	17	− 0.47	− 1.99 to 1.03	0.509	0.00	− 0.83 to 0.85	0.980	12.36	− 4.33 to 29.06	0.134

N number of patients, PAS penetration aspiration scale, FOIS Functional Oral Intake Scale, OPSE oropharyngeal swallow efficiency, CI confidence interval.