Table 2 Results of the stepwise multivariate logistic regression analysis

Intercept

-2.7717

0.06

(0.02—0.19)

 < 0.01

Age

  < 43 years

0

reference

 43–67 years

-1.024

0.36

(0.17—0.78)

 < 0.01

  ≥ 67 years

-2.4262

0.09

(0.04—0.22)

 < 0.01

Etiology

 Internal

  Cardiac

0

reference

  Respiratory

1.5243

4.59

(1.71—12.3)

 < 0.01

  Cerebrovascular

2.1272

8.39

(3.47—20.3)

 < 0.01

 External

1.2052

3.34

(1.57—7.1)

 < 0.01

 Unknown

0.7364

2.09

(0.71—6.19)

0.18

Low-flow time

  < 20 min

0

reference

  ≥ 20 min

1.7976

6.03

(2.18—16.7)

 < 0.01

  < 6.62

0

reference

pH

 6.62–7.06

0.6964

2.01

(0.74—5.44)

0.17

  ≥ 7.06

-0.1774

0.84

(0.27—2.6)

0.76