This study aimed to evaluate the difference in retention of CPR skills 1−year after a 45−minute chest compression−only CPR training program among participants receiving short self−learning refresher training at 3−month and 6−month intervals,as well as those without self−learning refresher training. A shoit self−learning refresher training every three or sixmonths after the chest compression− only CPR training could not be attributed to improvement in long−term retention of chest compressions with appropriate depth in university students.