Table 1.
Study characteristics.
| Characteristics | Mean | SD |
|---|---|---|
| Participants (n = 656) | ||
| Age (years)a | 31.51 | 5.87 |
| n | % | |
|---|---|---|
| Sexa | ||
| Female | 273 | 42.66 |
| Male | 367 | 57.34 |
| Sample sizeb | ||
| Experimental group | 438 | NA |
| Control group | 435 | NA |
| Study (n = 21) | ||
| Type of shift work | ||
| Rotating shift | 7 | 33.33 |
| Night shift | 14 | 66.67 |
| Simulated shift | ||
| Yes | 12 | 57.14 |
| No | 9 | 42.86 |
| Treatment period | ||
| Day only or mixed time | 10 | 47.62 |
| Night only | 11 | 52.38 |
| Research design | ||
| Randomized controlled trial | 9 | 42.86 |
| Randomized crossover trial | 12 | 57.14 |
| Use of intention-to-treat analysis | ||
| Intention-to-treat | 10 | 47.62 |
| Per protocol | 11 | 52.38 |
SD standard deviation, NA not applicable.
aMissing value in (number of study): mean age (3), SD age (4), sex (1).
bSample size: participants were included in both intervention and control groups in randomized crossover trials.