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Table 2: Demographics and body habitus^{^a}
Variable Sequence Group P Value^{^b}
Group B (n = 31) Group A (n = 33)
Sex 
    Male 20 (64.5) 23 (69.7) .79
    Female 11 (35.5) 10 (30.3) 
Age (yr) 61 ± 15 55 ± 17 .15
Body habitus 
    AP neck diameter at the level of mandible (C2–3) (mm) 185 ± 21 188 ± 21 .28
    AP diameter of midneck (C4–5) (mm) 127 ± 22 124 ± 19 .90
    Shoulder width (mm) 394 ± 35 394 ± 45 .84
    AP neck diameter at the level of mandible-to-shoulder width ratio 1.48 ± 0.15 1.53 ± 0.16 .35
    Shoulder width-to midneck AP diameter ratio 3.16 ± 0.40 3.21 ± 0.36 .88
↵a Values are No. (%) or mean ± SD unless otherwise specified.
↵b Mann-Whitney U test.

Variable	Sequence Group		P Value^{^b}
Variable	Group B (n = 31)	Group A (n = 33)	P Value^{^b}
Sex
Male	20 (64.5)	23 (69.7)	.79
Female	11 (35.5)	10 (30.3)
Age (yr)	61 ± 15	55 ± 17	.15
Body habitus
AP neck diameter at the level of mandible (C2–3) (mm)	185 ± 21	188 ± 21	.28
AP diameter of midneck (C4–5) (mm)	127 ± 22	124 ± 19	.90
Shoulder width (mm)	394 ± 35	394 ± 45	.84
AP neck diameter at the level of mandible-to-shoulder width ratio	1.48 ± 0.15	1.53 ± 0.16	.35
Shoulder width-to midneck AP diameter ratio	3.16 ± 0.40	3.21 ± 0.36	.88