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Table 1 Patient’s characteristics before and after imputation

From: Machine learning-based prediction of emergency neurosurgery within 24 h after moderate to severe traumatic brain injury

 

Unimputed

Imputed

Value

n

Value

n

Age, years

35 [24–52]

2159

35 [24–52]

2159

Female

494 (22.9)

2153

499 (23.1)

2159

BMI kg/m2

24 [22–26]

1829

24 [22–26]

2159

GCS

6 [3–9]

2159

6 [3–9]

2159

Initial oxygen saturation, %

97 [91–99]

1924

96 [90–99]

2159

Heart rate, beats per minute

91 [72–115]

1706

90 [75–110]

2159

Capillary hemoglobin value (HemoCue)

13.4 [12.0–14.9]

1717

13.0 [12.0–14.0]

2159

Initial blood pressure

    

  Systolic blood pressure

122 [100–140]

1709

121 [100–140)

2159

  Diastolic blood pressure

75 [60–89]

1701

72 (60–86]

2159

Orotracheal intubation in prehospital setting, n (%)

1818 (84.7)

2147

1820 (84.3)

2159

Presence of pupillary abnormalities, n (%)

762 (35.7)

2137

770 (35.7)

2159

Administration of osmotherapy (Mannitol or HSS), n (%)

515 (23.9)

2159

515 (23.9)

2159

Regression of pupil abnormality after administration of osmotherapy, n (%)

228 (34.7)

657

228 (34.7)

657

Type of accident

 

2158

 

2159

  Road traffic accident (%)

1150 (53.3)

 

1150 (53.3)

 

  Fall from height (%)

681 (31.6)

 

681 (31.6)

 

  Firearm (%)

118 (5.5)

 

118 (5.5)

 

  Hit by blunt object (%)

67 (3.1)

 

67 (3.1)

 

  Other

142 (6.6)

 

143 (6.6)

 

ISS head-neck

4 [2–5]

2159

4 [2–5)

2159

ISS

29 [22–38]

2110

29 (22–38]

2159

SAPS 2

50 [39–63]

2132

50 (39–63]

2159

SOFA

9 [7–12)

1367

8 [7–11]

2159

In hospital mortality, n (%)

573 (27.7)

2159

573 (27.7)

2159

  1. BMI body mass index, GCS Glasgow coma score, ISS injury severity score, SAPS 2 simplified acute physiology score