Fig. 2. Visual analog scale (VAS) ratings during the control (saline), low-dose remifentanil (0.05 μg · kg−1· min−1), and moderate-dose remifentanil (0.15 μg · kg−1· min−1) conditions. The differences between each of the experimental conditions were statistically significant (paired  t test). 

Fig. 2. Visual analog scale (VAS) ratings during the control (saline), low-dose remifentanil (0.05 μg · kg−1· min−1), and moderate-dose remifentanil (0.15 μg · kg−1· min−1) conditions. The differences between each of the experimental conditions were statistically significant (paired  t test). 

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