Method Design.’ A retrospective, epidemiological clinical design (ease-control) was used, wherein individuals with a specific health care problem (i.e. overweight) were matched with individuals who did not have the same health care problem (i.e. normal weight).2° Ethical consi(!erations.' Prior to data collection, approval to conduct the study was obtained from the Rcseztrch Ethical Review Committee, Faculty of Nursing, Chiang Mai University, and Directors or Principals of the schools chosen to be study sites.