Table 3 Univariate and multivariate logistic regression analyze variables screened by extreme gradient boosting in the training set

SAPS III

1.02

1.02 to 1.03

 < 0.001

1.01

1.00 to 1.02

0

SPO₂ (%)

0.86

0.82 to 0.90

 < 0.001

0.92

0.88 to 0.96

0.001

Age (years old)

1.01

1.01 to 1.02

 < 0.001

1.01

1.00 to 1.02

0.005

Respiratory rate (beats/minute)

1.13

1.09 to 1.16

 < 0.001

1.05

1.01 to 1.09

0.009

Lactate (mmol/L)

1.25

1.19 to1.31

 < 0.001

1.05

0.99 to 1.12

0.096

Bicarbonate (mmol/L)

0.89

0.86 to 0.91

 < 0.001

0.96

0.93 to 0.99

0.023

Heart rate (beats/minute)

1.03

1.02 to 1.03

 < 0.001

1.02

1.01 to 1.03

 < 0.001

Platelet (10⁹ /L)

1.00

1.00 to 1.00

0.1729

NA

Temperature (°C)

0.72

0.64 to 0.80

 < 0.001

0.77

0.66 to 0.88

 < 0.001

Calcium (mmol/L)

0.90

0.80 to 0.99

0.0347

0.93

0.82 to 1.07

0.308

GCS (mmol/L)

0.85

0.80 to 0.90

 < 0.001

0.86

0.81 to 0.92

 < 0.001

Potassium (mmol/L)

1.22

1.04 to 1.43

0.0157

0.93

0.76 to 1.13

0.441

Anion gap (mmol/L)

1.14

1.11 to 1.18

 < 0.001

1.04

1.00 to 1.08

0.051

MBP (mmHg)

0.97

0.96 to 0.98

 < 0.001

0.98

0.96 to 1.01

0.217

Hemoglobin (g/dL)

0.89

0.85 to 0.94

 < 0.001

0.92

0.86 to 0.98

0.008

WBC (10⁹ /L)

1.02

1.01 to 1.04

0.0022

1.00

0.99 to 1.02

0.665

DBP (mmHg)

0.98

0.97 to 0.99

 < 0.001

1.00

0.98 to 1.03

0.903