Table 1.
Baseline descriptive statistics comparing participant and shift schedule data between groups.
| Total (n = 149) | Control (n = 70) | Intervention (n = 79) | P | |
|---|---|---|---|---|
| SWD risk (% high) | 34 (23.9%) | 15 (21.4%) | 19 (24.1%) | .428a |
| Sex (% female) | 142 (96%) | 67 (95.7%) | 75 (94.9%) | .567a |
| Age | 34.66 ± 11.99 | 36.06 ± 12.99 | 33.42 ± 10.96 | .181b |
| BMI | 25.75 ± 5.46 | 26.20 ± 5.46 | 25.36 ± 5.48 | .352b |
| No. of day shifts (past month) | 9.04 ± 6.79 | 9.49 ± 8.68 | 8.65 ± 4.53 | .461b |
| No. of evening shifts (past month) | 7.56 ± 4.91 | 8.43 ± 5.93 | 6.77 ± 3.62 | .044*,b |
| No. of night shifts (past month) | 5.47 ± 3.35 | 6.04 ± 2.32 | 5.00 ± 3.98 | .228b |
| Years of shift work experience | 10.28 ± 8.44 | 10.39 ± 9.35 | 10.19 ± 7.61 | .888b |
| SHI | 32.59 ± 6.97 | 32.19 ± 7.83 | 32.95 ± 6.13 | .506a |
| ISI | 8.28 ± 5.50 | 7.97 ± 5.65 | 8.56 ± 5.39 | .519a |
| MEQ | 37.13 ± 6.22 | 37.27 ± 6.88 | 37.00 ± 5.62 | .791a |
| FOSQ-10 | 16.62 ± 2.36 | 16.63 ± 2.59 | 16.59 ± 2.15 | .923a |
| PHQ-9 | 4.57 ± 3.62 | 4.33 ± 3.69 | 4.78 ± 3.57 | .445a |
| GAD-7 | 3.52 ± 3.58 | 2.86 ± 3.26 | 4.10 ± 3.76 | .034*,a |
Values represent mean (standard deviation) or %. aChi-square, bt-test. *Significance P < .05 level (2-tailed). BMI = body mass index, FOSQ-10 = Functional Outcomes of Sleep Questionnaire 10, GAD-7 = General Anxiety Disorder Questionnaire, ISI = Insomnia Severity Scale, MEQ = Morningness-Eveningness Questionnaire, PHQ-9 = Patient Health Questionnaire, SHI = Sleep Hygiene Index, SWD = shift work disorder.