Table 1 Patient characteristics.
Variables | Collar (n = 85) | Control (n = 85) | P |
|---|---|---|---|
Age (year) | 58 (50–68) | 59 (51–68.5) | 0.533 |
Sex (male) | 51 (60.0) | 45 (52.9) | 0.439 |
BMI (kg m−2) | 25.7 (22.8–28.0) | 25.1 (22.8–27.1) | 0.623 |
Neck scar or goiter (%) | 4 (4.7) | 3 (3.5) | 1.000 |
Inter-incisor gap (cm) | 3.7 (3.3–4.0) | 3.8 (3.4–4.2) | 0.791 |
Thyromental distance (cm) | 8.5 (8.0–9.0) | 9 (8.0–9.8) | 0.141 |
Sternomental distance (cm) | 15.5 (14.0–16.8) | 16 (14.0–17.0) | 0.361 |
Ratio of height to thyromental distance | 18.9 (17.5–20.5) | 18.2 (17.2–19.9) | 0.244 |
Neck circumstance (cm) | 39 (37.0–41.0) | 37.6 (35.0–40.3) | 0.114 |
Modified Mallampati test | 0.442 | ||
Class 1 | 19 (22.4) | 21 (24.7) | |
Class 2 | 43 (50.6) | 48 (56.5) | |
Class 3 | 23 (27.1) | 16 (18.8) | |
Class 4 | 0 | 0 | |
Upper lip bite test | 0.113 | ||
Class 1 | 60 (70.6) | 47 (55.3) | |
Class 2 | 21 (24.7) | 33 (38.8) | |
Class 3 | 4 (4.7) | 5 (5.9) | |
Range of motion of the atlanto–occipital joint | 0.123 | ||
Class 1 (> 35°) | 53 (62.4) | 65 (76.5) | |
Class 2 (22°–34°) | 30 (35.3) | 15 (17.6) | |
Class 3 (12°–21°) | 2 (2.4) | 5 (5.9) | |
