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Histograms of the short‐term and long‐term variance for the 13 patients in the prone and supine positions: (a) short‐term velocity, prone; (b) short‐term velocity, supine; (c) long‐term velocity, prone; (d) long‐term velocity, supine. By the nonparametric Wilcoxon matched‐pairs signed‐rank test, the short‐term distributions (a) and (b) were significantly different for the two positions; however, the long‐term distributions (c) and (d) did not differ significantly.
