Table 2

A linear mixed model with industry as the random effect to explore impact on the number of calendar days a person is away from work due to a mild traumatic brain injury

	Estimate	SE	T value	P value
(Intercept)	3.19540	0.11674	27.371	<0.001
Workplace violence (WPV)	0.12329	0.06784	1.848	0.0646
Sex	0.11673	0.04626	2.523	0.0116
Age	0.30708	0.02119	14.556	<0.001
Income	0.00010	0.02111	0.005	0.996
Job class	0.06346	0.03131	2.027	0.0427
Rural/urban	0.06000	0.08200	0.732	0.4644
Coexisting conditions	−0.65095	0.05469	−11.902	<0.001

WPV was categorised as 0 if absent and 1 if present; age was categorised as 18–30, 31–40, 41–50 or 51–65 years; income was categorised as US$0–25 000, US$25 001–50 000, US$50 001–75 000 or US$75 001+; job class was categorised as 0 if sedentary or light work, 1 if medium work and 2 if heavy or very heavy work; rural/urban was categorised as 0 if rural and 1 if urban; sex was categorised as 0 if female and 1 if male; and coexisting conditions were categorised as 0 for none, 1 for one to four and 2 for five or more coexisting conditions.