MATERIALS AND METHODS
The study used a quasi-experimental interrupted timeseries
design, in which a series of sequential and repeated
observations are made both before and after
administration of the experimental treatment to all
participants, who thereby serve as their own controls.
Following institutional review board approval, 21
children were enrolled on a rolling basis in the study,
with written informed consent from parent and assent
from child. Data collection took place from April
2004 through February 2006. One child subsequently
moved out of state without returning her postintervention
diary. Data analyses were performed for the
20 children who completed all study questionnaires
and returned both the pre- and postintervention diaries.