Table 2. Associations between sleep disturbance, terms of employment and employment status.

Risk factor	Severe difficulty in falling asleep		Severe difficulty in staying asleep		Severe problem in waking early		Feeling unrefreshed		Insomnia
	OR	95%CI	OR	95%CI	OR	95%CI	OR	95%CI	OR	95%CI
All subjects (N= 8067)
Employed	1		1		1		1		1
Self-employed	0.9	0.6-1.3	0.8	0.6-1.0	0.7	0.6-1.0	0.8	0.6-1.0	0.9	0.7-1.0
Unemployed	4.2	3.2-5.6	2.6	2.1-3.3	2.3	1.8-2.9	3.2	2.6-4.0	3.1	2.6-3.8
Retired	1.5	1.1-2.0	1.2	1.0-1.5	1.1	0.9-1.4	1.0	0.8-1.2	1.1	0.9-1.2
Those in work (N=5470)
Employment status
Self-employed	1		1		1		1		1
Small employer (<500 staff)	1.1	0.8-1.7	1.3	1.0-1.8	1.4	1.0-1.8	1.3	1.0-1.6	1.1	0.9-1.4
Large employer (≥500 staff)	0.9	0.6-1.4	1.2	0.9-1.6	1.3	1.0-1.7	1.3	1.0-1.7	1.2	0.9-1.4
Weekly working hours
≤20 hours	1		1		1		1		1
>20-40	1.0	0.7-1.5	1.0	0.8-1.3	1.0	0.8-1.3	1.1	0.9-1.4	1.0	0.8-1.3
>40	1.3	0.8-2.1	0.9	0.7-1.3	1.0	0.8-1.4	1.0	0.8-1.4	1.0	0.8-1.3
Having a second paid job
No	1		1		1		1		1
Yes	0.6	0.3-1.1	0.9	0.6-1.2	1.0	0.7-1.3	0.9	0.7-1.3	1.0	0.7-1.3
Type of contract
Permanent	1		1		1		1		1
Temporary/renewable	0.5	0.2-1.1	1	0.7-1.5	0.7	0.4-1.1	0.9	0.6-1.3	0.8	0.6-1.1
Not applicable (self-employed)	1.0	0.6-1.5	0.8	0.6-1.1	0.7	0.5-1.0	0.8	0.6-1.0	0.9	0.7-1.1
Variable/rotating shift work
Sometimes/rarely/never	1		1		1		1		1
Often	1.9	1.4-2.6	1.3	1.1-1.7	1.3	1.0-1.6	1.5	1.3-1.9	1.4	1.2-1.7
Night shift work
Sometimes/rarely/never	1		1		1		1		1
Often	2.8	1.8-4.3	1.5	1.0-2.1	1.3	0.9-1.9	2.0	1.4-2.7	1.6	1.2-2.1
Holiday entitlement
Some	1		1		1		1		1
None	4.7	1.3-16.4	1.8	0.5-6.4	1.7	0.5-5.9	1.5	0.4-5.3	1.7	0.6-4.8

Odds (OR) ratios were adjusted for age and sex; CI – confidence intervals