Table 8. OLS regression of age milestones for NASA astronauts over all selections (1959–2013).
| Variables | Age at Selection | Age at First Flight | Age at Last Flight | Age at Retirement |
|---|---|---|---|---|
| Selection Year | 0.11*** | 0.08*** | 0.08*** | 0.02 |
| (0.013) | (0.022) | (0.025) | (0.040) | |
| Male | 2.57*** | 3.28*** | 2.89*** | 0.36 |
| (0.519) | (0.808) | (0.923) | (1.608) | |
| Military Experience | 1.61*** | 1.25 | 1.68* | 0.02 |
| (0.532) | (0.825) | (0.943) | (1.565) | |
| Previously NASA | 1.43*** | 0.74 | 2.03*** | 1.54 |
| (0.440) | (0.666) | (0.761) | (1.287) | |
| Ph.D. | 0.23 | 0.48 | 1.29 | 0.53 |
| (0.490) | (0.760) | (0.869) | (1.386) | |
| M.D. | 1.02* | 1.38 | 0.13 | 0.05 |
| (0.613) | (0.993) | (1.135) | (1.835) | |
| Pilot | -0.58 | -2.31** | 1.37 | 6.26*** |
| (0.522) | (1.050) | (1.200) | (1.650) | |
| Mission Specialist | -0.89* | -1.77* | 2.00* | 5.97*** |
| (0.477) | (0.991) | (1.134) | (1.624) | |
| Payload Specialist | 1.34* | -0.91 | 2.23* | 3.92* |
| (0.795) | (1.160) | (1.327) | (2.089) | |
| Management | 1.24** | 1.01 | 1.43 | 2.30 |
| (0.573) | (0.849) | (0.971) | (1.979) | |
| Constant | -192.3*** | -118.1*** | -125.3** | -2.6 |
| (26.19) | (43.56) | (49.81) | (79.54) | |
| Observations | 341 | 310 | 310 | 245 |
| R-squared | 0.309 | 0.148 | 0.140 | 0.109 |
Standard errors in parentheses.
*** p<0.01,
** p<0.05,
* p<0.1