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Table 2 Comprehensive sleep characteristics of maritime pilots and controls

From: Effects of long-term sleep disruption on cognitive function and brain amyloid-β burden: a case-control study

Measures   Controls, n = 16 Maritime pilots, n = 19 p value
PSG TST, min 406 ± 44 403 ± 51 0.86
N1, min 46 ± 18 41 ± 14 0.40
N2, min 232 ± 36 215 ± 36 0.20
DST, min 50 ± 25 66 ± 28 0.10
REM, min 68 ± 17 79 ± 17 0.10
WASO, min 61 ± 26 53 ± 39 0.48
SEF, % 85.8 ± 7.1 86.1 ± 9.4 0.91
SOL, min 8 ± 7 11 ± 9 0.32
Actiwatch No. awakenings 33.5 ± 11.1 37.8 ± 10.3 0.24
SEF, % 89.3 ± 4.3 86 ± 3.8 0.03*
PSQI (rest week vs. control Overall score 3.2 ± 1.4 4.5 ± 2.2* 0.049*
PSQI (work week vs. control) Overall score 3.2 ± 1.4 8.8 ± 2.9** < 0.001**
  1. Data is shown as mean ± SD (for normally distributed data)
  2. Actiwatch data and PSQI were collected in 2016 and 2017. Actiwatch data was collected for a period of 10 consecutive days; for maritime pilots, these 10 days were a mix of work and rest days. PSQI was administered twice for maritime pilots, including one work week and one rest week
  3. Abbreviations: PSG polysomnography, TST total sleep time, DST deep sleep time, REM rapid eye movement sleep, WASO wake after sleep onset, SEF sleep efficiency, SOL sleep onset latency, PSQI Pittsburgh Sleep Quality Index
  4. *Significant at p <0 .05
  5. **Significant at p < 0.001