Table 4 Multivariate analysis of oxygen use and potential confounders for survival

0.68 (0.39–1.17)

0.16

0.70 (0.38–1.27)

0.24

1.00 (0.99–1.01)

0.41

1.00 (0.99–1.01)

0.75

1.90 (1.21–2.99)

0.005

2.01 (1.22–3.33)

0.006

1.22 (0.75–1.99)

0.43

1.25 (0.75–2.11)

0.39

0.55 (0.40–0.76)

<  0.001

0.37 (0.24–0.55)

<  0.001

0.92 (0.64–1.32)

0.65

1.09 (0.74–1.61)

0.66

0.90 (0.47–1.74)

0.75

1.04 (0.48–2.26)

0.92