Table 2.
Baseline characteristics of participants versus screened individuals. Values are numbers (percentages) unless stated otherwise
| Characteristics | Participants | Screened | P value |
|---|---|---|---|
| Total | 23 | 69 | |
| Demographics | |||
| Median (SD) age (years) | 38.4 (9.7) | 43.0 (14.9) | 0.1 |
| Women | 10 (44) | 32 (46) | |
| Men | 13 (57) | 37 (54) | |
| Ethnic group: | 0.4 | ||
| American Indian or Alaska Native | 0 (0) | 2 (3) | |
| East Asian or South Asian | 8 (35) | 13 (19) | |
| Black or African American | 0 (0) | 2 (3) | |
| More than one race | 0 (0) | 4 (6) | |
| White | 15 (65) | 48 (70) | |
| Mean (SD) height (cm) | 171.7 (8.5) | 171.2 (11.0) | 0.8 |
| Mean (SD) weight (kg) | 75.2 (18.9) | 73.5 (15.5) | 0.7 |
| Medical history | |||
| Broken bones | 9 (39) | 26 (38) | 0.9 |
| Acrophobia | 9 (39) | 23 (33) | 0.6 |
| Parachute use | 3 (13) | 9 (13) | >0.9 |
| Family history of parachute use | 2 (8.7) | 10 (15) | 0.7 |
| Frequent flier (average >4 flights per month) | 4 (17) | 14 (20) | >0.9 |
| Flight | |||
| International v domestic flight: | 0.02 | ||
| International | 0 (0) | 8 (21) | |
| Domestic | 23 (100) | 31 (80) | |
| Aircraft type: | <0.001 | ||
| Jetliner | 0 (0) | 69 (100) | |
| Biplane | 11 (48) | 0 (0) | |
| Helicopter | 12 (52) | 0 (0) | |
| Mean (SD) velocity (km/h) | 0 (0) | 800 (124) | <0.001 |
| Mean (SD) altitude (m) | 0.6 (0.1) | 9146 (2164) | <0.001 |