Variable | Difficult intubation | Difficult laryngoscopy | ||||
---|---|---|---|---|---|---|
Yes (n = 56) | No (n = 2012) | P Value* | Yes (n = 123) | No (n = 1945) | P Value* | |
Sex, n | 0.185 | 0.001 | ||||
Male/ | 32 | 969 | 78 | 923 | ||
Female | 24 | 1043 | 45 | 1022 | ||
Age, yr, median (IQR) | 62 (52–69) | 50 (41–62) | < 0.001 | 61 (50–67) | 50 (40–61) | < 0.001 |
Body mass index, kg/m2 | 23.4 (3.6) | 22.9 (3.5) | 0.260 | 23.3 (3.4) | 22.8 (3.5) | 0.134 |
Thyromental distance, cm | 6.7 (0.8) | 7.7 (0.9) | < 0.001 | 7.0 (0.9) | 7.7 (0.9) | < 0.001 |
Modified Mallampati test > 2, n (%) | 34 (60.7) | 537 (26.7) | < 0.001 | 61 (49.6) | 510 (26.2) | < 0.001 |
Mouth opening, cm | 3.4 (0.5) | 4.1 (0.6) | < 0.001 | 3.6 (0.6) | 4.1 (0.6) | < 0.001 |
Hyomental distance, cm | 4.6 (0.4) | 5.3 (0.5) | < 0.001 | 4.7 (0.5) | 5.3 (0.5) | < 0.001 |
Tongue thickness, cm | 6.3 (0.5) | 5.9 (0.5) | < 0.001 | 6.3 (0.5) | 5.9 (0.5) | < 0.001 |
Grade of head-up angle, 1/2/3/4, n | 30/26/0/0 | 2006/6/0/0 | < 0.001 | 94/29/0/0 | 1942/3/0/0 | < 0.001 |
Small mandible, yes, n (%) | 15 (26.8) | 51 (2.5) | < 0.001 | 23 (18.7) | 43 (2.2) | < 0.001 |
TMJ range of motion, mm | 9.5 (2.5) | 14.0 (2.3) | < 0.001 | 10.7 (2.7) | 14.1 (2.2) | < 0.001 |
Expected glottal visibility, mm | -11.0 (8.1) | 9.6 (8.3) | < 0.001 | -5.3 (9.8) | 9.9 (8.1) | < 0.001 |