The surgeon 's eye blink rate at the end of thoracic stage decreased more from baseline in the DP group than in the PP group ( 3.0 1.4 blinks/min vs 1.2 0.9 blinks/min , p < 0.001 ) , and the surgeon 's symptom scale score was higher after operation with the patient in the DP than in the PP ( 6.29 1.54 vs 3.13 2.82 , p < 0.001 ) .