Table 2

Impact of sleep disorders and mental health on burnout

		Burnout		Crude	Model 1
	Total	N	Per cent	OR (95% CI)	OR (95% CI)
Insomnia DSM-5
No	1081	44	4.1	Ref.	Ref.
Yes	219	88	40.2	14.7 (9.8 to 21.9)**	13.6 (9.2 to 21.1)**
Severity of insomnia
Moderate	106	49	30.5	Ref.	Ref.
Severe	113	39	55.6	1.6 (0.4 to 2.1)	1.9 (0.3 to 1.0)
Type of insomnia
Difficulties of initiating sleep
No	1205	104	8.7	Ref.	Ref.
Yes	95	25	26.3	3.7 (2.2 to 6.1)*	3.5 (2.0 to 5.9)*
Difficulties of maintaining sleep
No	1130	72	6.4	Ref.	Ref.
Yes	170	58	34.1	7.5 (5.1 to 11.8)**	7.1 (5.0 to 11.5)**
Early morning awakening
No	1222	91	7.5	Ref.	Ref.
Yes	78	41	52.6	13.7 (8.4 to 22.5)**	11.3 (6.4 to 18.5)**
Non-restorative sleep
No	1262	109	8.6	Ref.	Ref.
Yes	37	18	48.6	9.9 (5.1 to 19.5)**	9.4 (4.8 to 17.5)**
Epworth sleepiness scale (ESS)
≤10	790	31	3.9	Ref.	Ref.
>10	510	101	19.8	6.0 (4.0 to 9.2)*	5.4 (4.2 to 8.3)*
Habitual sleep time (hour)
<6	30	5	16.7	2.0 (0.8 to 5.5)	2.3 (1.7 to 6.5)*
6–7	270	34	12.6	1.5 (0.9 to 2.3)	1.0 (0.2 to 1.2)
7–8	730	65	8.9	Ref.	Ref.
8–9	243	22	9.1	1.1 (0.6 to 1.7)	0.9 (0.5 to 1.2)
≥9	16	5	31.3	4.6 (1.4 to 14.3)*	4.1 (1.2 to 14.1)*
Difference between week and weekend sleep time (hour)
<0	30	1	3.3
0–1	210	10	4.8	Ref.	Ref.
1–2	503	57	11.3	2.6 (1.3 to 5.1)*	2.7 (1.4 to 5.2)*
2–3	349	33	9.5	1.9 (1.0 to 4.3)*	2.1 (1.2 to 4.6)*
3–4	120	17	14.2	1.6 (1.5 to 7.5)*	1.8 (1.7 to 8.0)*
Mental health
Anxiety-HADS
≤10	1145	70	6.1	Ref.	Ref.
>10	155	62	40.0	10.2 (6.8 to 15.3)*	9.8 (5.8 to 14.4)*
HADS-D
≤10	1244	124	10.2	Ref.	Ref.
>10	56	8	14.3	1.5 (0.6 to 2.1)	1.3 (0.5 to 2.0)

Model 1, OR adjusted for sociodemographic parameters (age, weight, sex, BMI, physical activity, smoking and alcohol habits).
*p<0.05, **: p<0.01.
CI 95%, 95% CI; N, occurrence; DSM, Diagnostic and Statistical Manual; HADS-D, Hospital Anxiety and Depression Scale-Depression; HADS-A, Hospital Anxiety and Depression Scale-Anxiety; OR, OR; Ref., reference.