one scholar in preschool education, one senior nurse in community service, one pediatric emergency physician, and one statistician. The face validity of the instrument was determined by the expert panel and had a CVI value of 0.97. The reliability of the instrument was determined through a pilot study with a sample of 34 patients. The reliability of internal consistency of 25 items on knowledge of first aid by KR20 was 0.70 at pilot and 0.69 at final study. Internal consistency of 12 items on self-efficacy of first aid by Cronbach’s was 0.91 at pilot and 0.89 at final study. Thus, the instrument had sufficient reliability and validity for use in this study.