Table 4 Threshold effect analyses of GNRI on risk of adverse post-extubation outcomes in critically ill older adults using two-piecewise regression models

Mortality within 30 days post-extubation

 GNRI (< 89.1)

0.96

0.94 ∼ 0.98

< 0.001

 GNRI (≥ 89.1)

0.98

0.96 ∼ 1.01

0.29

Pneumonia within 30 days post-extubation

 GNRI (< 88.1)

1.00

0.97 ∼ 1.02

0.82

 GNRI (≥ 88.1)

0.96

0.94 ∼ 0.98

< 0.001

Reintubation within 72 h

 GNRI (< 87.6)

0.95

0.92 ∼ 0.98

< 0.001

 GNRI (≥ 87.6)

1.01

0.98 ∼ 1.04

0.58

Post-extubation dysphagia

 GNRI (< 88.1)

0.99

0.96 ∼ 1.02

0.44

 GNRI (≥ 88.1)

0.98

0.94 ∼ 1.02

0.31

β

95% CI

P-value

Length of stay in ICU

 GNRI (< 88.6)

-0.11

-0.14∼ -0.08

< 0.001

 GNRI (≥ 88.6)

-0.03

-0.05∼ -0.01

0.006

Length of stay in hospital

 GNRI (< 88.1)

-0.24

-0.29∼-0.18

< 0.001

 GNRI (≥ 88.1)

-0.15

-0.19∼ -0.11

< 0.001