[Shift-work seniority increases the severity of sleep disorders. Comparison of different categories of shift-workers].
Shift-work disrupts the sleep-wake cycle and could bring about sleep disorders and excessive daytime sleepiness. We studied two samples of shift-workers, a group of 178 nurses and one of 174 police officers, all working in the town of Palermo (Italy); their answers to a sleep disorder questionnaire were scored and added in order to create a Sleep Disorder Score (SDS). The SDS cut-off value, discrimining pathological values from physiological ones, was settled a-priori. In both groups SDS did not depend on sex, age, weight, height nor on working seniority, but it increased non linearly (cubic form) with shift-work seniority. In nurses this mathematical description of SDS exceeded the cut-off value after 15 years of shift-work seniority; in police officers it settled asymptotically under the critical value. This could be ascribable both to the different composition in sex of the two samples (nurses: 49% F-51% M vs. police officers: 6% F-94% M) both to the self-selection process that seems to undergo police officers (nurses do not leave shift-work because of salary incentives).
Garbarino
S
S
Centro di Medicina del Sonno, DISM, Università degli Studi di Genova.
Mascialino
B
B
De Carli
F
F
La Paglia
G
G
Mantineo
G
G
Nobili
L
L
Ferrillo
F
F
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D012720:Severity of Illness Index; D020178:Sleep Disorders, Circadian Rhythm / Q000453:epidemiology*; D013997:Time Factors; D014940:Work Schedule Tolerance