Table 3.

Results of post hoc LSD test (P value) for comparison mean of infants' motor responses in paired groups.

	Groups	Time
		Before	During	Immediately after	1 hr after
Morning	Earmuff & silence	0.2	0.000*	0.000*	0.000*
	Earmuff & control	0.6	0.000*	0.05*	0.000*
	Silence & control	0.2	0.03*	0.003*	0.000*
Afternoon	Earmuff & silence	0.6	0.02*	0.02*	0.000*
	Earmuff & control	0.6	0.000*	0.000*	0.4
	Silence & control	0.3	0.000*	0.01*	0.001*

^*means that the difference is meaningful.