Table 1. Astronaut characteristics.

AstronautGroups	Selection Year	Age at Selection(years)	Orbital Missions Flown	Time in Space (days)	Age at Death(years)
Non-Flight	1970 ± 1.9 (median 1966)	34.2 ± 1.0	–	–	53.3 ± 3.0
All Flight	1976 ± 2.0 (median 1978)	33.5 ± 0.5	1.9 ± 0.2 (range 1–5)	15.6 ± 1.7 (range 0.2–49.2)	57.5 ± 2.2
Low Earth Orbit	1978 ± 2.1* (median 1978)	33.5 ± 0.6	2.0 ± 0.2 (range 1–5)	15.6 ± 1.8 (range 0.2–49.2)	56.0 ± 2.5
Apollo Lunar	1964 ± 1.0†(median 1966)	33.4 ± 0.7	1.7 ± 0.4 (range 1–4)	15.2 ± 5.7 (range 6.0–49.2)	65.2 ± 4.0

Values are mean ± SE. *Significantly different from non-flight group, P ≤ 0.05; ^†significantly different from the low Earth orbit group, P ≤ 0.05.