Research Article

Length of Individual Apnea Events Is Increased by Supine Position and Modulated by Severity of Obstructive Sleep Apnea

Figure 4

(a) Positional sleeping time adjusted distributions of the durations of individual hypopnea events in supine and nonsupine positions in different OSA severity categories and (b) distributions in nonsupine and supine positions as a function of OSA severity. In every OSA severity category, excluding normal category, the hypopnea events were slightly longer in nonsupine position than in supine position. Based on the mixed model analysis, the differences are statistically significant in all OSA severity categories excluding the normal category.
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