Table 2 Most recent data before extubation of different unplanned extubation (UE) groups.

Mean arterial pressure (mmHg)

98.0 ± 17.7 (50~153)

93.9 ± 23.0

98.8 ± 16.5

0.185

Heart rate (beats/min)

92.4 ± 17.1 (52~152)

95.0 ± 19.0

91.9 ± 16.7

0.365^a

Respiratory rate (/min)

17.6 ± 5.7 (7~36)

19.3 ± 6.1

17.3 ± 5.5

0.026

 pH

7.43 ± 0.06 (7.13~7.59)

7.40 ± 0.09

7.44 ± 0.05

0.015

 PaO₂ (mmHg)

107.7 ± 56.1 (24~506)

104.6 ± 65.2

108.3 ± 54.5

0.695

 FiO₂ (%)

31.5 ± 12.7 (21~100)

36.8 ± 19.1

30.2 ± 10.2

0.029

 PaO₂/FiO₂ (mmHg)

346.9 ± 131.9 (24~506)

313.8 ± 170.7

352.9 ± 123.0

0.152

 PaCO₂ (mmHg)

37.1 ± 8.3 (15.8~75.7)

36.7 ± 9.5

37.1 ± 8.1

0.802

 Tidal volume (mL)

508.6 ± 152.1 (209~1458)

501.3 ± 132.3

510.0 ± 155.7

0.542^a

 PEEP (cmH₂O)

5.9 ± 1.6 (0~14)

7.1 ± 2.2

5.6 ± 1.4

<0.001

 Hb

10.9 ± 2.0 (5.0~18.0)

10.2 ± 2.5

11.1 ± 1.8

0.012^a

 Hct

33.5 ± 7.0 (5.1~52.3)

31.0 ± 8.7

33.9 ± 6.6

0.013

 BUN

31.3 ± 23.5 (3~163)

48.7 ± 35.3

28.1 ± 19.1

<0.001^a

 Creatinine

1.9 ± 2.5 (0.4~26.2)

2.7 ± 2.2

1.8 ± 2.5

0.024

 Sodium

139.3 ± 6.3 (112.4~161.3)

138.6 ± 8.4

139.4 ± 5.9

0.542

 Potassium

3.9 ± 0.5 (2.6~5.9)

3.9 ± 0.6

3.8 ± 0.5

0.713

 Calcium

7.9 ± 0.9 (1.2~12.4)

8.0 ± 1.0

7.9 ± 0.9

0.579^a

 Phosphate

3.6 ± 1.8 (1.3~12.4)

4.2 ± 2.4

3.5 ± 1.6

0.292^a

 Albumin

2.7 ± 0.7 (0.9~4.4)

2.4 ± 0.7

2.8 ± 0.7

0.003

UE shift

0.234

 Day time

102 (34.7%)

14 (31.3%)

88 (35.2%)

 Evening time

112 (38.0%)

14 (31.1%)

98 (39.2%)

 Night time

81 (27.5%)

17 (37.8%)

64 (25.6%)

Agitation

95 (32.2%)

13 (28.9%)

82 (32.8%)

0.605

Sedatives

100 (33.9%)

17 (37.8%)

83 (33.2%)

0.550

Use of Lorazepine

24 (8.1%)

9 (20.0%)

15 (6.0%)

0.005

Weaning status

159 (53.9%)

12 (26.7%)

147 (58.8%)

<0.001