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Arq Neuropsiquiatr. 2005 Dec;63(4):925-30. Epub 2005 Dec 15.

Sleep habits, sleepiness and accidents among truck drivers.

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Instituto de Medicina Molecular, Faculdade de Medicina de Lisboa, Lisbon, Portugal.



To evaluate the quality of sleep, shift work, alcohol and psychostimulant drug use, and the prevalence of accidents among truck drivers.


Data were collected using a demographic questionnaire, the Epworth Sleepiness Scale (ESS) and the Pittsburgh sleep quality index (PSQI). Statistical analysis was conducted using the Student t, chi-square, Pearson and Fisher tests.


43.2% of the drivers drove over 16 h a day, and 2.9% worked shifts. Mean number of sleep hours/day was 5.97+/-1.47; 23.8% slept <5 hours; 50.9% made use of alcohol, 95.6% of caffeine, and 11.1% of amphetamines. Mean PSQI was 4.95+/-2.56; 35.4% had a PSQI >5; 23 subjects snored more than three times a week (11.1%). Mean ESS was 6.56+/-4.2; 21.7% had a score >10. In the preceding five years, 27 drivers (13.1%) were involved in accidents, 5 of which resulted in injuries and 3 in deaths.


Results showed a high prevalence of sleep disorders, use of alcohol and psychostimulant drugs, and accidents.

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