2.1. Participants

Fifty-four children (25 females, 29 males) completed the test-retest protocol with 5 days between tests. Children between 5–15 years of age who were in level I (able to walk in all settings with some balance and coordination impairments) or level II (walking is limited in some settings) according to the Gross Motor Function Classification System (GMFCS), had spastic CP on one (unilateral CP) or two sides (bilateral CP) of the body, could walk unassisted and could cooperate were included in the study. Children in GMFCS level I and II were included in this study because children in these levels were able to walk without support. The demographics and functional characteristics of the children can be seen in Table 1. Those who had received botulinum toxin injections in the past 6 months or those who had undergone an orthopedic surgery involving the lower extremities were excluded from the study. Before recruiting children for our study, a power analysis was performed. The sample size was calculated as 53 patients by using G-power version 3.1.9.5. according to the study by De Ridder et al. (effect size 0.17, α error probability = 0.05, and 80% power) [11]. Informed consent forms were obtained from the patients and their caregivers stating that they were willing to participate in the study. This study was approved by the ethical committee of X University and the authors conformed to the ethical guidelines of the 1975 Declaration of Helsinki.

Demographic and functional characteristics of children.

SD: Standard Deviations; GMFCS: Gross Motor Function Classification System.