Figure 2. Comparison of Polysomnographic Parameters to Parent-Reported Severity of Sleep-Disordered Breathing in Predicting Baseline Behavioral Outcomes .

Shown are results of a generalized linear model fitted to 2 representative behavioral outcome measures (Conners Global Index parent and teacher versions) and the Pediatric Sleep Questionnaire–Sleep-Related Breathing Disorder (PSQ-SRBD) score (panels A and C) and the Apnea Hypopnea Index (AHI) (panels B and D), after adjustment for all covariates, including demographic and socioeconomic characteristics. The model was fitted with a smoothing spline, with the error bars spanning 1 SD for the horizontal extent of the distribution. Eight polysomnographic parameters were compared with the PSQ-SRBD score in predicting the various baseline behavioral outcomes (panel E). The null-effect model included a regression comprising the covariates only and the baseline behavioral outcome of interest. The effect size was measured by estimating the change in proportion of variance (adjusted R²) by adding the clinical or polysomnographic parameter to the covariates-only model. BRIEF MI indicates Behavior Rating Inventory of Executive Function metacognition index; CBCL, Child Behavior Checklist; DSM-IV, Diagnostic and Statistical Manual of Mental Disorders (Fourth Edition); REM, rapid-eye-movement sleep; SpO₂, oxygen saturation as measured by pulse oximetry; and TST, total sleep time.