Table 3.

Result of contrast tests

Contrast	Variable	Control	Lesion
Difference between IMPAS 1 and IMPAS 7	PT ratio	<0.0001	ns
	MT ratio	<0.0001	ns
	Hyoid elevation	0.0004	ns
Difference between C and L for IMPAS 1	PT ratio		0.009
	MT ratio		ns
	Hyoid elevation		0.001
Difference between C and L for IMPAS 7	PT ratio		0.001
	MT ratio		0.0003
	Hyoid elevation		ns
Difference C and L for diff ofIMPAS 1–7	PT ratio		0.0001
	MT ratio		0.01
	Hyoid elevation		0.005

Bold control and lesion P values indicate significant factors. C, control; diff, difference; IMPAS, infant mammalian penetration-aspiration score; L, lesion; MT, middle tongue; ns, not significant; PT, posterior tongue.