Post-DBS change in sleepiness, apathy and QoL scores.
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One year after STN DBS, (A) ESS mean score was significantly decreased and (B) SAS mean score was significantly increased in relation to the baseline (n = 43–46). PDQ-39 summary index and several dimensions in PDQ-39 (C) and in RAND SF-36 (D) improved significantly in comparison to baseline (n = 32 and 45 respectively); paired t-test *p <0.05 and **p <0.01). Error bars represent the standard error of the mean, SEM. DBS, deep brain stimulation; QoL, quality of life; PDQ-39, Parkinson’s disease questionnaire; RAND SF-36, RAND SF-36-item Health Survey; PHC, physical health composite; MHC, mental health composite.