We plan to divide people based on the score of the GMFCS questionnaire into three categories with scores 1 and 2, with score 3 and with scores 4 and 5, and then to perform randomization in a way to select a number of samples from each of these categories almost equally in the intervention and control groups.
First, by drawing a two-by-two table, we specify all the placement situations of the samples in the final groups: 1) intervention/control 2) control/intervention 3) intervention/intervention/control/control. Then, by lottery, one of these arrangement methods is selected and we exceed to the next step.
In the next step, the ID of all the samples in the form of a code along with their GMFCS questionnaire scores are written on separate sheets and arranged randomly. Then in three envelopes (based on the scores of the GMFCS questionnaire, which had three categories with scores 1 and 2, with score 3 and with scores 4 and 5), on the sheets of the sorting system that was determined earlier (for example, intervention/intervention/control/control) In the same way, it is written separately and repetitively and placed inside triple envelopes.
Then the sheets related to the ID of the samples (which apart from their ID code, also includes their GMFCS score) are revealed in order, and based on their GMFCS scores, we go to the desired envelope and take out the sorted sheets from inside it. Based on the writing on the pages inside the envelope (intervention or control), the target sample is randomly placed in one of the intervention or control groups.