Table 1 Baseline and demographic details of patients

Age, years

56 (40–70)

Gender, male n (%)

211 (52 %)

ASA (n)

 1

119 (29.3 %)

 2

179 (44 %)

 3

93 (22.9 %)

 4

15 (3.7 %)

BMI

28 (24.6–32)

Class of surgery

 Elective

317 (78 %)

 Expedited

15 (3.7 %)

 Urgent

61 (15 %)

 Emergency

8 (2 %)

 Immediate

5 (1.2 %)

Specialty

 General surgery

117

 ENT

76

 Trauma and orthopedics

67

 Urology

34

 Gynecology

44

 Vascular

21

 Others

47

Duration

 Less than 1 h

130

 1–2 h

157

 2–4 h

81

 Greater than 4 h

34

Tidal volume^a (ml)

500 (484–575)

pPeak^a (cmH₂O)

20 (17–23)

PEEP^a (cmH₂O)

4 (1–5)

FiO₂ ^a (%)

50 (40–53)