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| Variable | Restricted sample | Full sample | |
| Home base time zone | Any time zone | ||
| Subjects (n) | 130 | 136 | 153 |
| Age (mean years) | 42 | 41 | 41 |
| Age (sd years) | 8 | 8 | 8 |
| Gender (% males) | 92% | 91% | 94% |
| Position | |||
| Captain | 50% | 49% | 50% |
| First Officer | 42% | 42% | 41% |
| Cabin crew | 4% | 4% | 4% |
| Other | 5% | 4% | 5% |
| Diurnal type | |||
| Extreme evening | 2% | 1% | 1% |
| Evening | 26% | 26% | 25% |
| Intermediate | 44% | 45% | 45% |
| Morning | 28% | 27% | 28% |
