Table 1.

Anthropometric data, grouped by those subjects with complete muscle data including trapezius (10 of 11 used in model development), and those lacking trapezius data (used for validation). Data shown are the average ± standard deviation, with the range in parenthesis. Neck length was defined as the vertical distance between the C7 spinous process and the tragus, measured using a wall-mounted stadiometer. Neck circumference was the average of the circumferences above and below the thyroid cartilage. Head circumference was the maximum circumference measured with a tape passing over the superciliary ridge and the opisthocranion. Percentile data are provided according to the data of Gordon et al. (1989); however, Gordon’s definition of neck circumference was slightly different: circumference at the infrathyroid landmark. Head circumference data were not available for all subjects in the group without trapezius data.

All muscle data	Female		Male
	n=3	Percentile	n=8	Percentile
Age (years)	29.9±10.8 (23–43)		31.6±8.7 (20–46)
Height (cm)	165.1±5.1 (161.2–170.9)	40%–89%	174.8±7.9 (161.1–184.0)	1%–89%
Weight (kg)	68.0±7.7 (60.7–76.0)	47%–94%	75.2±7.2 (65.3–87.3)	11%–79%
Neck length (cm)	11.3±0.9 (10.6–12.4)	78%–99%	11.8±1.9 (9.3–14.5)	13%–100%
Neck circumference (cm)**	34.5±1.3 (33.3–35.9)	87%–100%	39.1±1.9 (36.9–43.0)	30%–99%
Head circumference (cm)*	56.4±1.0 (55.6–57.6)	76%–97%	58.6±1.4 (56.3–60.0)	88%–100%
No trapezius data	n=3		n=3
Age (years)*	29.7±1.2 (29–31)		25.7±2.1(24–28)
Height (cm)*	166.2±5.3 (160.0–169.5)	33%–85%	178.0±3.5 (174.0–180.0)	41%–75%
Weight (kg)	67.7±5.8 (61.0–71.0)	49%–86%	79.3±7.4 (71.0–85.0)	26%–74%
Neck length (cm)**	11.1±0.6 (10.5–11.7)	75%–96%	13.0±0.3 (12.6–13.2)	97%–100%
Neck circumference (cm)	34.0±1.5 (32.4–35.3)	72%–98%	36.5±2.1 (35.0–38.9)	6%–70%

^*Sex differences noted by 0.01 ≤p<0.05

^**Sex differences noted by p<0.01.