Table 1.

Age and seniority in the shift system of the surveyed nurses.

Athens Insomnia Scale (AIS)							p #	Insomnia Risk + Clinical Insomnia (vs. Norm)		Clinical Insomnia (vs. Norm)
	Norm		Insomnia Risk		Clinical Insomnia
	N	%	N	%	N	%
Age								OR (95% CI)	p *	OR (95% CI)	p *
20–30	8	28.57%	13	46.43%	7	25.00%	0.0055	1.00	-	1.00	-
31–40	9	36.00%	14	56.00%	2	8.00%		0.71 (0.22–2.26)	0.5637	0.25 (0.04–1.60)	0.1438
41–50	20	32.79%	30	49.18%	11	18.03%		0.82 (0.31–2.18)	0.6911	0.63 (0.18–2.20)	0.4677
51–60	3	25.00%	1	8.33%	8	66.67%		1.20 (0.26–5.61)	0.8168	3.05 (0.57–16.19)	0.1910
Work experience in the profession of a nurse in years
0–10	13	33.33%	18	46.15%	8	20.51%	0.0389	1.00	-	1.00	-
11–20	7	30.43%	12	52.17%	4	17.39%		1.14 (0.38–3.47)	0.8136	0.93 (0.21–4.21)	0.9234
21–30	17	32.08%	27	50.94%	9	16.98%		1.06 (0.44–2.56)	0.8988	0.86 (0.26–2.84)	0.8051
31–40	3	27.27%	1	9.09%	7	63.64%		1.33 (0.30–5.88)	0.7041	3.79 (0.76–19.05)	0.1056
Work experience in a shift system in years
0–10	11	28.21%	20	51.28%	8	20.51%	0.0469	1.00	-	1.00	-
11–20	11	36.67%	13	43.33%	6	20.00%		0.68 (0.25–1.88)	0.4557	0.75 (0.20–2.89)	0.6759
21–30	14	31.11%	24	53.33%	7	15.56%		0.87 (0.34–2.23)	0.7715	0.69 (0.19–2.49)	0.5678
31–40	4	33.33%	1	8.33%	7	58.33%		1.05 (0.23–4.69)	0.9515	2.41 (0.52–11.10)	0.2604
Number of night shifts per month
3–4	2	10.53%	11	57.89%	6	31.58%	0.3529	1.00	-	1.00	-
5–6	22	32.35%	32	47.06%	14	20.59%		0.25 (0.05–1.16)	0.0763	0.21 (0.04–1.20)	0.0798
7–8	11	40.74%	10	37.04%	6	22.22%		0.17 (0.03–0.90)	0.0365	0.18 (0.03–1.20)	0.0762
More than 8	5	41.67%	5	41.67%	2	16.67%		0.17 (0.03–1.06)	0.0575	0.13 (0.01–1.32)	0.0848

N—number of respondents; %—percent; p #—statistical significance of the Chi square test; p *—statistical significance of univariate logistic regression; OR—odds ratio; 95% CI—95% confidence interval.