Table 1 Demographics, clinical features, and analgesics administered to the patients in the four groups

Age (y)

74 ± 3

73 ± 4

72 ± 4

72 ± 5

Weight (kg)

100 ± 11

99 ± 10

101 ± 8

101 ± 10

ASA class (I/II)

35/30

34/31

36/29

35/30

Hypertension or coronary heart disease (%)

29

31

28

31

Pulmonary disease (%)

14

15

17

15

Operative time (min)

115 ± 15

116 ± 14

119 ± 13

120 ± 12

PACU stay (min)

30 ± 6^a

32 ± 4^a

32 ± 5^a

51 ± 9

Sufentanil (μg)

64 ± 12^a

65 ± 10^a

66 ± 9^a

98 ± 11

Propofol (mg)

1379 ± 108

1382 ± 105

1377 ± 107

1381 ± 108

Postoperative fentanyl (g)

651 ± 65^a,b,c

775 ± 76^a,c

911 ± 101^a

1232 ± 104