Table 1 General information of patients in the three groups and the surgical types. The differences among the three groups and between each two groups were not statistically significant(p > 0.05)

Age (yr.)

44.7 ± 11.65

44.1 ± 12.86

43.8 ± 15.22

Height (cm)

155.6 ± 5.56

154.4 ± 7.23

156.3 ± 8.23

Weight (kg)

80.3 ± 6.05

79.2 ± 10.34

80.5 ± 5.17

BMI (kg.m⁻²)

33.18 ± 2.87

33.23 ± 3.22

32.97 ± 2.36

mouth opening(I)(II)(III)(IV)

(32)(1)(0)(0)

(33)(0)(0)(0)

(33)(1)(0)(0)

thyromental Distance(I)(II)(III)

(27)(5)(1)

(28)(5)(0)

(30)(4)(0)

neck circumference(I)(II)(III)

(11)(19)(3)

(13)(18)(2)

(10)(20)(4)

mallampati class (I)(II)(III)(IV)

(8)(23)(2)(0)

(7)(22)(4)(0)

(8)(22)(4)(0)

Snore history [n (%)]

11 (33%)

13 (39%)

13 (38%)

OSAHS [n (%)]

0 (0%)

0 (0%)

1 (3%)

ASA(I)(II)

(28)(5)

(30)(3)

(30)(4)

 TCRP [n(%)]

4 (12)

5 (15)

6 (18)

 TCRM [n(%)]

6 (18)

5 (15)

6 (18)

 TCRS [n(%)]

11 (33)

12 (36)

11 (32)

 TCRA [n(%)]

12 (36)

11 (33)

11 (32)