Table 3 Baseline comparison of the training dataset, validation dataset and check dataset for extubation time prediction model

Anesthesia time (min)

40.00(30.00, 55.00)

45.00 (30.00, 60.00)

40.00 (30.00, 60.00)

CK-MB (U/L)

8.00 (4.00, 19.00)

8.50 (3.75, 19.00)

8.00 (4.00, 18.00)

MCV (fL)

86.40(82.40, 90.18)

86.40(83.00, 90.43)

86.10(82.00, 89.80)

Ondansetron usage (no/yes)

498/778(39.00%/61.00%)

92/182(33.60%/66.40%)

103/171(37.60%/62.40%)

Mean corpuscular hemoglobin concentration (g/L)

318.35 ± 19.34

319.94 ± 18.28

320.20 ± 20.70

Muscle relaxant types (atracurium/cisatracurium)

789/487(61.80%/38.20%)

180/94(65.70%/34.30%)

159/115(58.00%/42.00%)

Preoperative atropine (mg)

0.31(0.21, 0.50)

0.30(0.22, 0.50)

0.40(0.23, 0.50)

Nalbuphine (mg)

3.52 ± 1.85

3.62 ± 1.83

3.70 ± 2.07

ETCO2 (mmHg)

38.30 ± 2.55

38.07 ± 2.44

37.93 ± 2.36

Cystatin (mg/L)

0.79 ± 0.20

0.78 ± 0.20

0.81 ± 0.21

Urine routine (normal/abnormal)

930/346(72.90%/27.10%)

198/76(72.30%/27.70%)

206/68(75.20%/24.80%)

Tidal volume (ml)

280.00(180.00, 400.00)

265.00(190.00, 400.00)

295.00(190.00, 400.00)

Creatinine (μ mol/L)

44.00(36.00, 55.00)

44.00(37.00, 55.00)

45.00(37.00, 59.25)

Platelet ratio (%)

0.235(0.208, 0.267)

0.238(0.206, 0.268)

0.233(0.200, 0.265)

Transfusion volume (ml)

160.00(120.00, 230.00)

180.00 (130.00, 230.00)

170.00 (130.00, 230.00)

Operation history (no/yes)

1132/144(88.70%/11.30%)

244/30(89.10%/10.90%)

241/33(88.00%/12.00%)

Anesthesiologists

-

-

-

Surgery types

-

-

-

Surgeons

-

-

-

Extubation time (min)

55.00(45.00, 70.00)

60.00(45.00, 75.00)

60.00(45.00, 75.00)