Table 3.
Subjects Who Displayed Postflight Vestibular Abnormalities after Space Shuttle and ISS Missions.
| Subjects, n (%) |
|||
|---|---|---|---|
| Space Shuttle (n = 14) | ISS (n = 16) | P Valuea | |
| Oculomotor tests | |||
| Saccades/pursuit | 0 (0) | N/A | N/A |
| Positional nystagmus | 1 (7) | N/A | N/A |
| Gaze-evoked nystagmus | 4 (29) | 6 (38) | .709 |
| Motor tests | |||
| Pointing | 10 (71) | 4 of 7 (57) | .638 |
| Chair stand test | 8 (57) | 4 of 14 (29) | .251 |
| Postural stability | 5 (36) | 5 (31) | .999 |
| Tandem walking | 11 (79) | 9 of 9 (100) | .253 |
| Symptoms | |||
| Reentry motion sickness | 0 (0) | 16 (100) | <.001 |
| Headache | 4 (29) | 1 (6) | .157 |
| Space motion sickness | 7 (50) | N/A | N/A |
| Subjective reports | |||
| Motion illusions | 7 (50) | 12 (75) | .257 |
| Feeling unstable | 13 (93) | 16 (100) | .467 |
Abbreviations: ISS, International Space Station; N/A, not available.
a
Fisher’s exact test.