Table 3.

Data on sleep problems of the 196 day and night workers enrolled in the study. All data were calculated from the results obtained from the Insomnia Severity Index score. n° = number; % = percentage.

	Daily Workers		Night Workers
	n°	%	n°	%
	196	100	196	100
No clinically significant insomnia	167	85.2	151	77
Subthreshold insomnia	15	7.7	29	14.8
Moderate clinical insomnia	12	6.1	16	8.2
Severe clinical insomnia	1	0.51	-	-