Female students, as adolescent girls, are more at risk of anemia because of high nutritional requirements. Health education through mobile applications influences the knowledge, attitude, and practice (KAP) of anemia in adolescent girls. Based on our previous study, several adolescents experienced anemia. This study aims to analyze the effect of health education through mobile applications, namely the WANTER application, on increasing KAP. This study was quasi-experimental with a pretest−posttest design; the sample was divided into an intervention (WANTER application) and a control group (booklet). The study was conducted in a rural area of Indonesia. There were 162 adolescent girls included in the intervention group and as many as 115 adolescent girls in the control group. Our study showed that adolescents’ knowledge and attitude increased significantly in three months after the intervention of WANTER and booklets toward preventing anemia with p < 0.001; however, there was no significant difference in KAP between the control and intervention groups. In addition, there was no improvement in practice, either in the control or intervention groups. Knowledge, attitudes, and practices to prevent anemia need to be continuously improved. Health education through appropriate media for adolescents is very important to make interventions more effective.
Keywords: adolescent girls; anemia; attitude; booklet; knowledge; mobile health education; practice (KAP).