Fuel for Fun: a cluster-randomized controlled study of cooking skills, eating behaviors, and physical activity of 4th graders and their families

Table 2 Sample size requirements for power levels of 0.8 and 0.9 based on prior studies of Cooking with Kids

^aBased on repeated pre/post measures using standard deviations from previous research. For example, a total of 100 participants are needed in this two-treatment parallel-design study. The probability is 80 % that the study will detect a treatment difference in student attitude at a two-sided 0.05 significance level, if the true difference between treatments is 2 units. This is based on the assumption that the standard deviation of the response variable is 3.5
website: http://hedwig.mgh.harvard.edu/sample_size/js/js_parallel_quant.html

ISSN: 1471-2458