No procedures outside of the clinic's routine were performed on the children in the control group. As part of the clinic's routine education program, information about kidney function, CKD, nutrition, exercise, medications, and stress management is provided verbally by a nephrology clinic nurse in approximately 20 minutes. The Chronic Kidney Disease Information Form, the Healthy Lifestyle Belief Scale for Adolescents, and the Child's Attitude Toward Their Own Illness Scale were administered to the children before the education program, after the program, and at the end of the first and third months, and the relevant clinical parameters were measured.

A mobile game application was downloaded onto the phones of the children participating in the study group. Before starting the mobile game, after completing the application, and at the end of the first and third months, the Chronic Kidney Disease Information Form, the Healthy Lifestyle Belief Scale for Adolescents, and the Child's Attitude Toward Their Own Illness Scale were administered, and relevant clinical parameters were measured. At the end of the study, the Mobile Application Usability Scale was also administered.

As part of the clinic's routine education program, information about kidney function, CKD, nutrition, exercise, medications, and stress management is provided verbally by a nephrology clinic nurse in approximately 20 minutes.

BMI in kg/m^2

The information form consists of 25 questions. The information form has been created with two answers, correct and incorrect. Correct answers are worth 1 point, while incorrect answers are worth 0 points, and the form is evaluated based on the total score. A reliability analysis was performed using Kuder Richardson 20 (KR-20) to evaluate whether the items that make up the question form form a whole.

The scale emphasizes beliefs related to various aspects of maintaining a healthy lifestyle. The scale has a total of 16 items. The scale has three subscales: health beliefs, physical activity, and nutrition. The health beliefs subscale is composed of items 4, 5, 6, 11, 12, 13, and 16; the physical activity subscale includes items 2, 7, 9, 14, and 15; and the nutrition subscale comprises items 1, 3, 8, and 10. The scale, prepared according to the five-point Likert system, is answered on a scale of "1=Strongly Disagree, 5=Strongly Agree." A minimum of 16 and a maximum of 80 points can be obtained from the entire scale. An increase in the score obtained from the scale indicates an increase in adolescents' belief in healthy living.

The Child's Attitude Toward Their Own Illness Scale is a 13-item measure developed to assess children's feelings and thoughts about having a chronic illness. Participants respond to the scale items using a 5-point Likert scale: "never, not often, sometimes, often, and very often." Items 1, 2, 3, 4, 5, 7, 9, 11, and 13 are reverse-coded. When evaluating the scale, the scores obtained from the 13 items are summed and divided by the number of items. The total score range is min: 1 to max: 5. Scores of 1 and 2 indicate a negative attitude, 3 indicates a neutral attitude, and 4 and 5 indicate a positive attitude.