Variable

POST (%)

ARR (95% CI)

P value

Body weight 

25.01 - 70.00 

70.01 - 90.00

89(28.0)

        14(77.8)

Referent

2.5 (1.13-5.75)

                                               0.025

Smoking status

No

Yes

93(29.1)

10(62.5)

Referent

1.62(0.65-4.08)

0.302

Number of intubation trial

One 

Two or more

78(26.4)

25(61.0)

Referent

2.19(1.20-4.00)

0.011

Presence of blood on ETT

No 

Yes 

80(26.8)

23(62.2)

Referent

1.63(0.87-3.04)

0.129

Time from intubation to extubation

10 – 39

40 – 69

70 – 99

≥ 100

7(25.0)

56(27.3)

25(32.9)

15(55.6)

Referent

    1.00(0.33-2.53)

0.91(0.27-3.03)

0.70(0.05-10.09)

0.994