Table 2 Conditional logistic regression analysis for risk of acute lung injury/acute respiratory distress syndrome (ALI/ARDS) in the sepsis cohort (left) and trauma cohort (right)

Age (increment of one year)

0.98

0.84 to 1.15

0.805

0.93

0.77 to 1.13

0.482

Gender (male versus female)

1.14

0.63 to 2.04

0.668

0.81

0.39 to 1.71

0.586

Diabetes (yes versus no)

0.61

0.33 to 1.12

0.110

1.10

0.39 to 3.08

0.854

Smoking (never versus ever)

1.63

0.86 to 3.11

0.136

1.15

0.54 to 2.41

0.720

Vitamin D levels (summer)^a

1.16

0.60 to 2.25

0.663

1.25

0.55 to 2.86

0.591

Vitamin D levels (winter)^a

1.68

1.05 to 2.69

0.029

1.23

0.74 to 2.06

0.425

Season (winter versus summer)^b

1.36

0.49 to 3.75

0.553

0.61

0.20 to 1.86

0.385