Table 1 Pre- and intraoperative characteristics

Preoperative characteristic values

 Age (years)

50.4

7.6

51.1

10.0

 Height (cm)

157.1

5.7

158.0

4.6

 Weight (kg)

55.3

10.5

58.7

10.9

 Hypertension (%)

12.5

11.8

 Dyslipidemia (%)

9.4

26.5

 Diabetes mellitus (%)

3.1

5.9

 Cerebrovascular disease (%)

0.0

0.0

 Oral hypnotic drugs on the day of surgery (%)

6.3

17.6

Intraoperative characteristic values

 Operating time (min)

113

48

118

39

0.69

 Anesthesia time (min)

163

55

169

44

0.62

 Total dose of fentanyl (µg)

215.6

49.9

216.2

79.5

0.97

 BIS value before anesthesia

98

1

98

1

0.23

 BIS value during surgery (mean)

46

6

54

9

 < 0.001

 BIS value before leaving OR

(the time at which the patients responded)

95

4

88

8

 < 0.001