Table 4.

Descriptive summary of ultrasound‐measured muscle thickness using the four‐site protocol

Variable median (IQR)	All (n = 96)	Men (n = 41)	Female (n = 55)	P‐value	Younger (<60, n = 55)	Older (≥60, n = 41)	P‐value
Four‐site protocol–minimal compression
Right mid‐point, cm	4.07 (3.36–4.80)	4.59 (3.98–5.32)	3.51 (2.95–4.26)	<0.001	4.43 (4.06–5.12)	3.37 (2.75–3.89)	<0.001
Right distal third, cm	3.04 (2.43–3.72)	3.53 (3.00–4.29)	2.71 (2.12–3.25)	<0.001	3.48 (3.01–4.18)	2.46 (2.01–2.97)	<0.001
Left mid‐point, cm	3.97 (3.29–4.70)	4.67 (3.95–4.99)	3.67 (2.96–4.05)	<0.001	4.30 (3.92–4.97)	3.26 (2.83–3.95)	<0.001
Left distal third, cm	3.08 (2.41–3.71)	3.65 (2.91–4.24)	2.72 (2.16–3.21)	<0.001	3.45 (3.00–4.17)	2.39 (2.06–2.91)	<0.001
Average, cm	3.53 (2.82–4.24)	4.17 (3.44–4.58)	3.12 (2.59–3.72)	<0.001	3.92 (3.45–4.52)	2.80 (2.42–3.44)	<0.001
Four‐site protocol–maximal compression
Right mid‐point, cm	1.68 (1.32–2.14)	1.97 (1.56–2.35)	1.51 (1.22–1.96)	<0.001	2.04 (1.59–2.21)	1.40 (1.19–1.59)	<0.001
Right distal third, cm	1.53 (1.20–1.92)	1.79 (1.37–2.03)	1.37 (1.07–1.69)	<0.001	1.77 (1.32–2.03)	1.28 (0.97–1.56)	<0.001
Left mid‐point, cm	1.68 (1.41–2.14)	1.92 (1.62–2.31)	1.48 (1.26–1.93)	<0.001	1.99 (1.61–2.30)	1.47 (1.23–1.66)	<0.001
Left distal third, cm	1.45 (1.19–1.85)	1.69 (1.42–2.10)	1.24 (1.11–1.72)	<0.001	1.72 (1.37–2.02)	1.22 (0.98–1.47)	<0.001
Average, cm	1.56 (1.30–1.98)	1.93 (1.48–2.18)	1.37 (1.17–1.85)	<0.001	1.86 (1.51–2.18)	1.32 (1.15–1.53)	<0.001

IQR, interquartile range.