The total numberlof preschoolers in the study provii1C6a on June 10, 2007, was usedas the study’s sample frame.21’ 22 Based on information available from previous studies, which presented the significant odds ratio and proportion of exposure to potential factors related to overweight among preschool children, two equations were performed. 23"“ With a two-tailed alpha level of 0.05 and power of 0.8, a minimum of 77 cases (caregivers of overweight preschoolers) and 385 matched controls (caregivers of normal weight preschoolers) were determined to be an adequate sample size to detect statistically significant relationships among the variables.