Table 3 Multinomial logistic regression analysis with outcomes at discharge as dependent variable

The timing of tracheostomy (from intubation, days)

 Grouping criteria I

  ≤ 5d

0.78(0.52,1.16)

NA

0.79(0.25,2.46)

NA

  5 < d ≤ 10d

Reference

NA

Reference

NA

  > 10d

1.6(1.07,2.38) *

NA

1.56(0.66,3.7)

NA

 Grouping criteria II

  ≤ 7d

NA

0.73(0.51,1.05)

NA

1.42(0.58,3.51)

  7 < d ≤ 14

NA

Reference

NA

Reference

  > 14d

NA

1.2(0.73,1.96)

NA

2.04(0.79,5.31)

 Age, y

  ≤ 50

Reference

  50–60

0.82(0.52,1.28)

0.82(0.52,1.29)

2.5(0.5,12.7)

2.57(0.51,12.98)

  60–70

0.91(0.59,1.39)

0.92(0.6,1.41)

1.4(0.25,7.6)

1.43(0.26,7.95)

  70–80

1.16(0.75,1.79)

1.16(0.75,1.78)

2.9(0.59,14.2)

2.88(0.58,14.2)

  > 80

0.86(0.5,1.47)

0.85(0.5,1.46)

11.7(2.7,51.6)

11.93(2.7,52.72) **

 Sex

  Female

Reference

  Male

1.17(0.86,1.58)

1.16(0.85,1.57)

1.8(0.82,3.88)

1.75(0.8,3.82)

 Duration of stay

  hospital

1.02(1,1.05)

1.02(1,1.05)

1.04(1.01,1.07)*

1.04(1,1.07)*

  ICU

0.93(0.9,0.95)***

0.93(0.9,0.95)***

0.93(0.89,0.97)***

0.93(0.9,0.97)***

 Type of tracheostomy

  Percutaneous

Reference

  Surgical

1.38(1.04,1.84) *

1.37(1.03,1.82) *

2.07(1.07,3.98) *

2.14(1.1,4.16)*

 Length of MV

  Total

1.03(0.99,1.06)

1.04(1,1.08) *

1.06(1.01,1.11) *

1.06(1.01,1.12)*

  after TT

1.04(1.01,1.08) *

1.03(1,1.07)

0.98(0.94,1.03) *

0.98(0.94,1.03)

  Length of sedation

1.01(1,1.02)

1.01(1,1.03) *

1.02(1,1.04)

1.02(1.01,1.04)*