Variable

POST 

No n (%)

Yes n (%)

RR (95% CI)

Type of Analgesics

Fentanyl 

Pethidine

Other^∞

201(70.0)

17(70.8)

15(62.5)

86(30.0)

7(29.2)

9(37.5)

Referent

0.97 (0.51-1.86)

0.78 (0.35-1.75)

Type of Muscle relaxant used for intubation

Succinylcholine

Rocuronium

Vecuronium

166(70.6)

60(68.2)

7(58.3)

69(29.4)

28(31.8)

5(41.7)

Referent

1.09(0.75-1.56)

1.42(0.71-2.85)

Type of laryngoscope used

Macintosh

Glide Scope video-laryngoscope

123(74.1)

110(64.7)

43(25.9)

60(35.3)

Referent

1.36(0.98-1.89)

Size of laryngoscope blade used

Size no 4

Size no 3

30(63.8)

202(70.1)

17(36.2)

86(29.9)

Referent

0.83(0.54-1.26)

Number of intubation trials

  One (1)

  Two (2) or more

217(73.6)

16(39.0)

78(26.4)

25(61.0)

Referent

2.30 (1.69-3.14)***

NGT insertion

NGT used

NGT not used

28 (73.7)

205(68.8)

10 (26.3)

93 (31.2)

                                                         0.84 (0.48-1.47)

Type of ETT used

Cuffed polyvinylchloride (PVC)

Cuffed Spiral

205(68.1)

28(80.0)

96(31.9)

7(20.0)

Referent

1.60 (0.81-3.16)

Size of ETT used in millimeter

Six point five

Seven

Seven point five/Eight

Six mm

99(74.4)

40(67.8)

45(64.3)

49(66.2)

34(25.6)

19(32.2)

25(35.7)

25(33.8)

Referent

0.76 (0.49-1.16)

0.95 (0.58-1.56)

1.06 (0.68-1.66)

Type of  lubricant for ETT used

Gel Used (Water soluble)

Not used

26(81.3)

207(68.1)

6(18.8)

97(31.9)

0.59 (0.8-1.23)

Referent

 Oral airway insertion

Yes

No

191 (68.7)

42(72.4)

87(31.3)

16(27.6)

1.13 (0.72-1.78)

Referent

Presence of blood on ETT

Yes

No

14(37.8)

219(73.2)

23(62.2)

80(26.8)

2.32 (1.70-3.18)***

Referent

Time from intubation to extubation (in Minutes)

 10-39

40-69

70-99

  ≥100

21(75.0)

149(72.7)

51(67.1)

12(44.4)

7(25.0)

56(27.3)

25(32.9)

15(55.6)

Referent

1.09 (0.55-2.16)

1.32 (0.64-2.70)

2.22 (1.08-4.59)*

Intraoperative Suction used

  No

  Yes

23 (79.3)

210 (68.4)

6 (20.7)

97 (31.6)

Referent

1.53 0.74-3.17)