Table 3.

Number and Duration of Daily Interventions

InterventionsInfant Massage Group (n = 26) Mean (SD)Crib Vibrator Group (n = 28) Mean (SD)
Number of intervention periods/d
 First wk2.2 (.5)2.5 (1.0)
 Second wk2.2 (.6)2.1 (1.3)
 Third wk2.0 (.6)1.9 (1.3)
Duration of intervention (h/d)
 First wk .9 (.3)1.3 (.6)
 Second wk .9 (.4)1.2 (.8)
 Third wk .8 (.3)1.0 (.8)