Table 2

Studies examining acute injury outcomes where newest worker group is ≤12 months at the job or firm

Author date	Quality	Study design	Covariates included D=demo graphic; W=work place; O=other	Tenure measurement	Newest worker group	Injury label	Newest workers sign. Elevated risk?	Evidence synthesis (support/no support)
Chau et al 20103	High	Cohort	W	Time at firm	<1 year	Fall, same level	No	Support*
						Fall, lower level	Yes
						Handling material	Yes
						Handling during assembly	No
						Lifting equipment	No
						Operating machines	No
						Collision with object	No
						Collision with vehicle	No
						Hand tools	No
						Other	No
Chau 2014	High	Cohort	D, W	Time at firm	<1 year	Women, all acute injuries	No	No support
Chau 2014	High	Cohort	D, W	Time at firm	<1 year	Men, all acute injuries	Yes	No support
Kubo 2013	Medium	Longitudinal	D, W	Time at particular job	0–12 months	All acute injuries	Yes	Support
Sahl 1997a	High	Cohort	D	Time in a particular job	<1 year	Dog attacks	Yes	No support
						Fall, same level	Yes
						Walking	No
						Step on Sharp object	Yes
						Strike on gate	No
						Lift object	No
Sahl 1997b	Medium	Cohort	D	Time at firm	0–6 months	All acute injuries	Yes	Support
Breslin and Smith4	High	Cohort	D, W	Time at firm	<1 month	Contact with objects	Yes	Support
						Falls	Yes
						Bodily reaction or exertion	Yes

Please refer online supplementary appendix file for full reference details of author lists.
*Table III of Chau 2014 provides an aggregate analysis of all acute injuries for male railroad workers by length of service, and shows that the new workers are at significantly elevated risk compared to the most experienced workers. According to our evidence synthesis procedures, this aggregate of all acute injuries analysis takes priority over the stratified injury analyses provided in Chau 2010.