Table 1 Comparisons of patients with and without difficult intubation.

From: Observation of the validity of the upper lip bite test in predicting difficult intubation

Variable

Difficult intubation (Yes) n = 64

Difficult intubation (No) n = 2458

P value*

Sex (Male/Female, n)

30/34

1212/1246

0.701

Age (y)#

55(49–67)

50(39–60)

 < 0.001

Body mass index (kg/m2)#

24.0(21.5–25.7)

22.9(20.8–25.1)

0.152

ULBT > 1 grade (Yes/No, n)

48/16

1125/1333

 < 0.001

ULBT > 2 grade (Yes/No, n)

18/46

121/2337

 < 0.001

Mouth opening (mm)#

35(30–38)

40(38–45)

 < 0.001

Thyromental distance (mm)#

70(60–77)

77(72–83)

 < 0.001

Modified Mallampati test > 2 grade (Yes/No, n)

35/29

394/2064

 < 0.001

  1. Data are shown as the means ± standard deviation or numbers.
  2. *All patient characteristics were compared using the Mann–Whitney U test for continuous variables and the chi-square or Fisher exact test for categorical variables.
  3. #Data are displayed as the median (interquartile range).
  4. ULBT upper lip bite test.
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