Table 5 Results of single-factor analysis of the risk factors for tube obstruction

Patient-related characteristics

 Age, years, mean

52.9

55.0

0.348^a

 BMI, kg/m², mean

22.1

22.5

0.706^a

 Sex

0.789

  Male

6 (66.7)

26 (61.9)

  Female

3 (33.3)

16 (38.1)

 Smoker

5 (59.5)

25 (55.6)

0.826

 Alcohol drinker

4 (44.4)

25 (59.5)

0.407

 Neck height (cm)

45.8

43.2

0.360^a

 Pretracheal soft tissue thickness (cm)

9.9

11.8

0.181^a

Treatment-related characteristics

0.074

 Type of neck dissection

  Unilateral

8 (88.9)

24 (57.1)

  Bilateral

1 (11.1)

18 (42.9)

 Type of flap used

0.384

  Fasciocutaneous

1 (11.1)

14 (33.3)

  Musculocutaneous

7 (77.8)

23 (54.8)

  Osteocutaneous

1 (11.1)

5 (11.9)

 Type of tube used

0.802

  Single cannula

8 (88.9)

36 (85.7)

  Double cannula

1 (11.1)

6 (14.3)