Table 2 Workers sleep characteristics
From: Bridging the gap: examining circadian biology and fatigue alongside work schedules
Variable | “2 x 2 x 4” schedule | “4 x 4 x 4 schedule” | “fixed 12 h” schedule | p | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Valid n | Mean/n | SD/% | Valid n | Mean/n | SD/% | Valid n | Mean/n | SD/% | ||
Mean nocturnal sleep duration between diurnal workdays (hh:mm) | 18 | 05:42 | 00:46 | 15 | 05:10 (1) | 00:53 | 11 | 06:19 | 00:38 | 0.003 |
Mean diurnal sleep duration after nocturnal workdays (hh:mm) | 18 | 03:53 | 00:53 | 15 | 03:26 | 01:17 | N/A | N/A | N/A | 0.257 |
Mean nocturnal sleep duration on free-days (hh:mm) | 18 | 08:03 | 00:55 | 15 | 07:27 | 00:43 | N/A | N/A | N/A | 0.041 |
Mean total nap duration (hh:mm) | 13 | 01:39 | 00:32 | 11 | 01:28 | 00:21 | N/A | N/A | N/A | 0.371 |
Mean duration of naps between nocturnal shifts (hh:mm) | 13 | 01:44 | 00:37 | 10 | 01:32 | 00:21 | N/A | N/A | N/A | 0.339 |
Midsleep between diurnal workdays (hh:mm) | 18 | 02:43 | 00:40 | 15 | 02:28 (1) | 00:33 | 11 | 02:52 | 00:42 | 0.001 |
Midsleep after nocturnal workdays (hh:mm) | 18 | 10:52 | 01:42 | 15 | 10:47 | 01:26 | N/A | N/A | N/A | 0.766 |
Midsleep on free-days (hh:mm) | 18 | 05:22 | 02:09 | 15 | 04:50 | 01:30 | N/A | N/A | N/A | 0.197 |
Sleep regularity index | 16 | 39 (2) | 7 | 15 | 54 (2) | 7 | 11 | 72 (2) | 8 | < 0.001 |
Sleepiness (ESS) | 17 | 6.6 | 4.4 | 15 | 5.1 | 3.0 | 11 | 7 | 5.0 | 0.466 |
Insomnia (ISI) | 17 | 6.2 | 5.2 | 15 | 2.2 (3) | 1.7 | 11 | 6.1 | 4.4 | 0.017 |
Apnea (STOP BANG, %) | 0.873 | |||||||||
High risk | 17 | 2 | 12 | 14 | 2 | 14 | 11 | 2 | 18 | |
Intermediate risk | 17 | 3 | 18 | 14 | 2 | 14 | 11 | 1 | 9 | |
Low risk | 17 | 12 | 71 | 14 | 10 | 71 | 11 | 8 | 73 | |
