PT Journal AU Nielsen, HB Larsen, AD Dyreborg, J Hansen, ÃM Pompeii, LA Conway, SH Hansen, J Kolstad, HA Nabe-Nielsen, K Garde, AH TI Risk of injury after evening and night work – findings from the Danish Working Hour Database SO Scandinavian Journal of Work, Environment & Health PD 7VL PY 2018 BP 385 EP 393 IS 4 DI 10.5271/sjweh.3737 WP https://www.sjweh.fi/show_abstract.php?abstract_id=3737 DE accident; Danish Working Hour Database; evening shift; evening work; injury; night shift; night work; risk of injury; shift work; work pattern; work schedule tolerance SN 0355-3140 AB '

'

OBJECTIVES ': 'Evening and night work have been associated with higher risk of injury than day work. However, previous findings may be affected by recall bias and unmeasured confounding from differences between day, evening and night workers. This study investigates whether evening and night work during the past week increases risk of injury when reducing recall bias and unmeasured confounding.

'

'

METHODS ': 'We linked daily working hours at the individual level of 69 200 employees (167 726 person years from 2008–2015), primarily working at hospitals to registry information on 11 834 injuries leading to emergency room visits or death. Analyses were conducted with Poisson regression models in the full population including permanent day, evening and night workers, and in two sub-populations of evening and night workers, with both day and evening or night work, respectively. Thus, the exchangeability between exposure and reference group was improved in the two sub-populations.

'

'

RESULTS ': 'Risk of injury was higher after a week with evening work [incidence rate ratio (IRR) 1.32, 95% confidence interval (CI) 1.26–1.37] and night work (IRR 1.33, 95% CI 1.25–1.41) compared with only day work. Similar, although attenuated, estimates were found for evening work among evening workers (IRR 1.18, 95% CI 1.12–1.25), and for night work among night workers (IRR 1.10, 95% CI 1.01–1.20).

'

'

CONCLUSION ': 'There is an overall increased risk of injury after a week that has included evening or night work compared with only day work. Though attenuated, the higher risk remains after reducing unmeasured confounding.

ER