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Scatterplots illustrating the relationship between mean digit span backward improvement (difference score used for illustrative purposes) and sleep parameters. (A) Night 2 slow-wave sleep (SWS) per cent; (B) severity of Night 2 night time oxygen desaturation in patients with Parkinson's disease on dopaminergic medication. P-values are uncorrected. The correlation is significant after Hochberg correction for Night 2 slow-wave sleep but not for Night 2 oxygen desaturation.
