Table 4 VT at the beginning of surgery, minimum SpO₂, maximum PETCO₂, total propofol and analgesic drug dose, Cpt, Ce and BIS

VT at the beginning of surgery (mL)

135.0 (0.0, 226.8)

194.0 (121.5, 253.8)

0.007

Minimum SpO₂ (%)

86.0 ± 8.6

91.6 ± 7.7

< 0.001

Maximum PETCO₂ (mmHg)

53. 7 ± 8.6

51.1 ± 7.1

0.080

Propofol dose (mg)

372.2 ± 160.7

423.9 ± 179.2

0.099

Analgesic drug consumption (ml)

3 (3, 3)

3 (3, 3)

0.174

Cpt during the operation (mcg·mL-1)

2.8 (2.4, 3.4)

3.4 (3.0, 3.8)

< 0.001

Ce during the operation (mcg·mL-1)

2.7 (2.4, 3.1)

3.3 (2.9, 3.7)

< 0.001

Cpt at OAA/S = 5 (mcg·mL-1)

1.3 (1.0, 1.8)

1.6 (1.4, 1.9)

0.002

Ce at OAA/S = 5 (mcg·mL-1)

1.8 (1.4, 2.6)

2.3 (1.9, 2.7)

0.002

BIS at OAA/S = 5 (mcg·mL-1)

81.0 (78.0, 82.7)

78.5 (76.0, 81.0)

0.003