Table 3.

Age- and gender-adjusted incidence rate ratio (IRR) of long-term injury leave by shift and criteria used to define long-term injury among 419 police officers. [95% CI=95% confidence interval]

Criteria for long-term injury (duration of leave in days)	Cases	Night versus day		Afternoon versus day		Night versus afternoon
	N	IRR	95% CI	IRR	95% CI	IRR	95% CI
≥1	257	1.75	1.26–2.45	1.05	0.75–1.48	1.66	1.23–2.24
≥5	190	1.53	1.04–2.27	1.08	0.73–1.60	1.42	1.00–2.01
≥10	167	1.40	0.93–2.13	1.03	0.69–1.55	1.36	0.94–1.97
≥15	142	1.65	1.05–2.57	1.04	0.66–1.62	1.59	1.06–2.37
≥30	111	1.82	1.09–3.04	1.23	0.74–2.04	1.48	0.94–2.33
≥90	40	3.12	1.35–7.21	1.42	0.54–3.71	2.21	1.04–4.68