Statistical Analysis
Demographics, clinical parameters, and prevalence of comorbidities between the two groups were analyzed using Mann Whitney U test for continuous variables and Chi-Square tests, with Fisher’s Exact test being used to verify results when cell counts were small, for categorical variables. Comparison of polysomnographic parameters was performed between children with and without HF using analysis of covariance (ANCOVA) adjusting for age at time of sleep study. We performed Pearson correlation between OAI as well as CAI with echocardiogram parameters. Furthermore, we analyzed the relationship between LogCAI and age at time of sleep study using Pearson correlation coefficient. Finally, we compared demographic and echocardiographic parameters in children with normal CAI and children with elevated CAI. All analytic assumptions were verified, and all analyses were performed using SPSS v26 statistical software (Armonk, NY: IBM Corp). In this pilot study we sought to determine the relationship between CSA and HF, so sample size was limited to the small number of patients meeting inclusion criteria.