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Sleep knowledge by grade and educational intervention. Open bars – control groups that did not receive educational leaflet; gray bars – experimental groups that received educational leaflet. Number of participants: control groups – n = 156 for the 1st grade, n = 146 for the 2nd grade, n = 153 for the 3rd grade, and n = 120 for the 4th grade; experimental groups – n = 166 for the 1st grade, n = 151 for the 2nd grade, n = 162 for the 3rd grade, and n = 146 for the 4th grade.
