Table 3 Subgroup analyses based on age, congestive heart failure, sepsis, respiratory failure, RRT and duration of mechanical ventilation

Age

 <60

1.77 (1.08-2.92)

0.024

 ≥60

1.20 (0.91-1.58)

0.198

Congestive heart failure

 No

1.37 (1.00-1.88)

0.049

 Yes

1.13 (0.78-1.64)

0.511

Sepsis

 No

1.12 (0.62-2.01)

0.716

 Yes

1.35 (1.04-1.76)

0.026

Respiratory failure

 No

1.29 (0.87-1.92)

0.211

 Yes

1.27 (0.94-1.71)

0.122

RRT

 No

1.37 (1.04-1.81)

0.027

 Yes

0.98 (0.61-1.57)

0.924

Duration of mechanical ventilation

 <7 days

1.07 (0.78-1.47)

0.670

 ≥7 days

1.75 (1.21-2.54)

0.003