Table 5 Accuracy of the separate and combined weaning indices

Single TF indices^b

   RR_s (breaths/minute)

< 5

1.69

0.31

5.45

0.86

0.46

0.72 (0.55–0.89)

   RSBp (breaths/minute per ml per kg)

< 2

1.21

0.36

3.36

0.82.

0.43

0.71 (0.56–0.87)

   ROP (cmH ₂ O/breaths per minute per ml)

<10

2.13

0.43

4.73

0.89

0.38

0.72 (0.55–0.88)

   Pi _max (cmH ₂ O)

> 50

1.38

0.62

2.23

0.84

0.30

0.56 (0.35–0.77)

Endurance indices

   PTI (no unit)

< 0.08

1.47

0.53

2.77

0.85

0.33

0.61 (0.43–0.79)

   TTI₁ (%)

< 0.2

1.53

0.73

2.10

0.85

0.27

0.55 (0.36–0.74)

   TTI ₂ (%)

<0.05

1.71

0.50

3.42

0.86

0.35

0.65 (0.47–0.84)

TF combinations^c

   (0.66 × RR_s) + (0.34 × Pi_max)

< 1.3

2.49

0.50

4.98

0.90

0.35

0.72 (0.55–0.89)

   (0.5 × RSB) + 0.5 Pi_max

< 1.5

1.60

0.57

2.81

0.86

0.32

0.63 (0.45–0.82)

   (0.66 × ROP) + (0.34 × Pi _max )

<1.5

2.13

0.43

4.95

0.89

0.38

0.74 (0.60–0.89)

Best TF^d and best endurance index combination

(0.6 × ROP) – (0.1 × Pi_max) + (0.5 × TTI₂)

< 1.3

6.4

0.51

12.55

0.96

0.34

0.76 (0.62–0.90)