Table 1 Demographics of the study patients

Gender (male/female), n (%)

36/17 (68/32)

32/23 (58/42)

ASA I/II/III, n (%)

17/24/12 (32/45/23)

18/28/9 (33/51/16)

Age (years), mean(SD)

58.7 (13.8)

55.3 (13.8)

Height (cm), mean(SD)

163 (7.6)

162 (8.2)

Weight (kg), mean(SD)

66 (11.7)

62.3 (12.6)

BMI (kg/m²), mean(SD)

24.7 (3.4)

23.5 (3.8)

Tragus–nose tip–xiphisternum distance (cm), mean(SD)

56.2 (3.8)

55.6 (3.6)

Nose tip–earlobe distance (cm), mean(SD)

14.2 (1.1)

13.9 (1)

Neck circumference (cm), mean(SD)

36.2 (4.3)

34.9 (3.7)

Mallampati score I/ II/ III-IV, n (%)

23/25/5 (43.4/47.2/9.4)

30/17/8 (54.5/31/15.5)

Cormack–Lehane classification I/ II/ III-IV, n (%)

18/20/15 (34/38/28)

18/23/14 (33/42/25)