2.5. Statistical Analysis
Descriptive statistics were used to present study data. The Shapiro-Wilk test was used to confirm normality of the data. To test for possible differences between groups at baseline (T0), independent sample The BSID-III scores and GMFM total scores were used to describe overall motor development and to visually explore differences in the developmental trajectories of infants between groups using graphs. Scores on the different scales of the ITQOL-SF47 were compared between groups. A difference of ≥10 points in mean scores was regarded as a reasonable difference based on the reported standard deviations found in previous studies [For both groups, intraindividual Adherence will be calculated as the percentage of the registrated total training time with respect to the total planned training time (28 hours). To analyse the short closing interviews with parents and the physical therapist, interviews were transcribed verbatim and summarized related to the open-ended questions regarding their overall experiences with the intervention, their perception of the outcome of the intervention, their perception of potential barriers in the execution of the training program and their perception of using the multisensory bracelet (only in the EI-UL – MuSSAP intervention group).