Table 3

 Unadjusted relative risk (95% CI) of various lifestyle and work related factors and sleep disorders according to work pattern

Irregular/other (n = 2948)Rotating, no nights (n = 327)Permanent nights (n = 638)Rotating, with nights (n = 978)
*Service/sales or heavy manual (Appendix 2).
Each odds ratio compares presence to absence of the risk factor.
ESS, Epworth Sleepiness Score.
Occupation (NZSCO99 5–9)*2.79 (2.51–3.10)2.94 (2.30–3.75)6.40 (5.20–7.99)4.48 (3.85–5.21)
Working >40 hours per week0.40 (0.36–0.44)0.62 (0.49–0.79)0.11 (0.08–0.16)0.78 (0.68–0.89)
Snoring0.68 (0.62–0.74)0.83.(0.66–1.05)0.43 (0.36–0.52)0.93 (0.81–1.06)
Daytime sleepiness (ESS >10)1.06 (0.92–1.23)1.11 (0.76–1.63)1.00 (0.75–1.33)1.46 (1.19–1.80)
Current smoking1.22 (1.10–1.37)1.31 (0.98–1.75)1.97 (1.63–2.38)1.55 (1.32–1.83)
Obesity (BMI 30+)0.84 (0.75–0.94)0.85 (0.63–1.16)0.77 (0.61–0.97)0.96 (0.80–1.14)