Table 2.

Demographic and preoperative data of patients

Patient characteristics	Group C (n = 48)	Group M (n = 47)
Age	47 (30.8–55.8)	36 (26.0–50.0)
Gender (M/F) (n)	29/19	27/20
BMI (kg/m2)	22.8 ± 3.5	24.4 ± 3.8
ASA class (n)
I/II/III	10/33/5	17/26/4
Mallampati class (n)
I/II/III/IV	21/18/5/4	16/19/10/2
Thyromental distance (cm)	8.0 (8.0–9.0)	8.0 (8.0–10.0)
Neck circumference (cm)	37.5 (34.0–39.8)	38.0 (36.0–40.0)
Inter-incisor distance (cm)
Without collar	4.0 (4.0–5.0)	4.0 (4.0–5.0)
With collar	2.5 (2.0–3.0)	2.0 (2.0–3.0)

Values are expressed as mean ± SD, median (interquartile range 25th–75th) or number (%), SDStandard deviation

BMI Body mass index, ASA American society of anesthesiologists