Table 3.

Cut-off Values of MT Based on 2 SD Below the Young Adult Means for Corresponding Muscles

	Males		Females
	Cut-Off (cm)	Prevalence of Low Muscle Mass (%)	Cut-Off (cm)	Prevalence of Low Muscle Mass (%)
RF MT	1.85	69.4	1.42	36.7
VI MT	1.13	35.5	0.81	25.9
QF MT	3.17	72.6	2.34	33.8
GM MT	1.41	25.8	1.44	35.7
Sol MT	3.55	4.8	3.34	12.1
TS MT	5.32	19.4	4.96	22.9
MT sum	8.86	60.0	7.49	28.1
SMI		20.3		21.4

Abbreviations: MT, muscle thickness; SD, standard deviation RF, rectus femoris; VI, vastus intermedius; QF, quadriceps femoris; GM, medial head of gastrocnemius; Sol, soleus; TS, triceps surae; MT sum, sum of MT of QF and TS; SMI, skeletal muscle mass index.