Table 1.  Median and normal range of STD.

		< 60 years old	≥ 60 years old	All ages
LQ (s)	Median	0.0	0.1	0.0
	Normal range	–0.4 to 1.2	–0.4 to 2.0	–0.4 to 1.6
CB (s)	Median	0.4	4.4	1.2
	Normal range	–0.5 to 7.8	–0.4 to 51.2	–0.5 to 26.0
CK (s)	Median	2.0	4.2	2.4
	Normal range	–0.3 to 12.0	–0.3 to 58.1	–0.4 to 30.4
MX (s)	Median	1.8	1.9	1.9
	Normal range	0.0 to 10.0	0.0 to 11.9	0.0 to 10.7