Block allocation method will be used for random allocation in this study. In this way, according to age, patients are categorized into two age groups: 6-8 years old and 9-11 years old. Then the patients have criteria for entering the study based on whether they are in the group of 6-8 years old or the group of 9-11 years old and based on coincidence, the first person aged 6-8 years old is in one of the treatment groups and the second and third person aged 6-8 years old respectively in The second and third groups of treatment are placed, and also based on the coincidence, the first person aged 9-11 is placed in one of the treatment groups, and the second and third person, 9-11 years old, are placed in the second and third treatment groups, respectively, and this process continues until completion. The sample size will continue.
How to group, allocate and blind:
In order for the study to be double-blind, the researcher randomly divides the subjects into groups 1, 2, and 3, and they are referred to the person responsible for the treatment (pharmacy) with such a code. Ritalin, Stimedit and Practisa are placed in the same capsules and are given to patients by the pharmacy in pre-prepared envelopes according to codes 1, 2 and 3.
The therapeutic dose of methylphenidate tablets 10 mg manufactured by Novartis company for the first week (daily, one quarter in the morning and one quarter in the evening), the second week (daily, one half in the morning and one half in the evening) and the third week onwards based on the patient's tolerance (daily , one in the morning and one in the evening) is recommended. It should be noted that it will be done in the same way in each age group.