Demographic and training characteristics of participants
| Characteristic | Group; no. | |
|---|---|---|
| Standard | Night float | |
| No. | 11 | 6 |
| Age ± SD, yr | 30.9 ± 3.1 | 31.3 ± 2.2 |
| Training level | ||
| PGY-1 | 1 | 0 |
| PGY-2 | 3 | 0 |
| PGY-3 | 2 | 2 |
| PGY-4 | 4 | 4 |
| PGY-5 | 1 | 0 |
PGY = postgraduate year; SD = standard deviation.