Table 2 Associations of primary exposure (being nonagenarian) with mortality and management strategies in a multilevel logistic regression model

Treatment withheld

27% (1945)

35% (279)

< 0.001

aOR 1.54

(95% CI 1.22–1.94; p = < 0.001)

aOR 0.95

(95% CI 0.67–1.36; p = 0.79)

Treatment withdrawn

14% (1026)

13% (102)

0.24

aOR 1.03

(95% CI 0.77–1.39; p = 0.82)

aOR 0.73

(95% CI 0.48–1.10; p = 0.13)

NIV

25% (1794)

21% (168)

0.014

aOR 0.79

(95% CI 0.61–1.03; p = 0.08)

aOR 0.85

(95% CI 0.59–1.22; p = 0.36)

Mechanical Ventilation

52% (3685)

41% (324)

< 0.001

aOR 0.72

(95% CI 0.56–0.93; p = 0.01)

aOR 1.26

(95% CI 0.85–1.87; p = 0.26)

RRT

11% (816)

4% (33)

< 0.001

aOR 0.32

(95% CI 0.19–0.53; p = < 0.001)

aOR 0.55

(95% CI 0.28–1.08; p = 0.08)

Vasoactive drugs

59% (4179)

52% (414)

< 0.001

aOR 0.74

(95% CI 0.58–0.95; p = 0.017)

aOR 0.90

(95% CI 0.60–1.35; p = 0.62)

30d Mortality

40% (2743)

44% (337)

0.029

aOR 1.39

(95% CI 1.13–1.72); p = 0.002)

aOR 1.25

(95% CI 0.90–1.74; p = 0.19)

ICU-Mortality

27% (1921)

27% (213)

0.97

aOR 1.10

(95% CI 0.87–1.40); p = 0.43)

aOR 0.91

(95% CI 0.63–1.32; p = 0.63)