Table 2.

Characteristics of ISS crewmembers and control subjects after completing study

	ISS Crewmembers
	Rookie (n = 4)	Veteran (n = 4)	Control Subjects (n = 6)
Age, yr	41 (37–45)	53 (51–53)	33 (27–42)
Sex	3 Male, 1 female	4 Male	5 Male, 1 female
Length of mission, days	175 (166–199)	210 (137–340)	N/A
No. of space flight missions	1 (1)	3.75 (2–6)	N/A
No. of crewmembers completing EVAs during mission	2	3	N/A

Data are mean (range) for n = 8 International Space Station (ISS) crewmembers and 6 control subjects. EVA, extravehicular activity; N/A, not applicable to control group.