PURPOSE: The study was conducted to examine the effect of a training program provided to asthmatic children/adolescents on disease course and self-efficacy. METHODS: This prospective study consisted of both experimental and control subjects. The study population was composed of children/adolescents aged 10 to 18 years, who presented at Health Centers within Tokat province with asthma and who were currently using inhaler treatments. The study sample included 40 patients each in both the control and experimental groups. Asthmatic Child Information Form, Disease Evaluation Form, Peak Expiratory Flow Rate Evaluation Form and an Asthmatic Child/Adolescent Self-Efficacy Scale were used to collect data on research outcomes. Data were statistically analyzed with paired sample t-test, McNemars test, independent samples t-test. RESULTS: A significant increase in mean self-efficacy score was observed in the experimental group following training sessions. The experimental training was also associated with a reduction in asthma symptoms, less limitations to daily function and fewer attacks following physical activity relative to the control subjects. The children/adolescents in the experimental group were more conscious of the symptoms of asthma attacks and used preventive and rescue medications regularly, and reported fewer absences from school and fewer emergency room visits (p < 0.05). The average peak expiratory flow rate was 62.5% in the experimental group. After training, there were significant decreases in the number of attacks and the need of increasing inhaler doses in the experimental group. CONCLUSIONS: The study results show that the training program is effective in increasing self-efficacy and improving asthma symptoms among children/adolescents. Nurses should offer the training program to support children/adolescents during asthma attacks, and encourage the development of self-efficacy.

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