Table 2.

Characteristics of the studies selected for final inclusion.

	Type	N	Period	Contact person	Manual	Injury/1000 h	Age	Exposure factor	National/Reserve
Hagglund et al; 2006	P	263	2 seasons	Y	N	NA	17-39	I	Y
Azubuike & Okojie; 2009	T	196	1 season	NA	N	NA	NA	I	NA
Waldén et al; 2005	P	266	1 season	Y	Y	9.4	NA	I	Y
Paus et al; 2003	P	376	2 seasons	Y	N	1.42	16-19	I	NA
Paus et al; 2003	P	86	7 seasons	Y	N	9.1	17-37	I	NA
Cohen et al; 1997	R	200	3 seasons	Y	N	NA	16-40	I	NA
Kucera et al; 2005	P	ND	3 seasons	NA	N	NA	16-19	NI	NA
Selistre et al; 2009	T	ND	6 days	Y	N	128.1	16-20	I	NA
Palacio et al; 2009	P	30	2 seasons	N	N	NA	18-35	I	NA
Yoon et al; 2004	T	411	2 seasons	Y	N	141.8	average 22	I	Y
Martinez & Villani 2003	R	656	7.4 seasons	NA	N	NA	<20	I	Y
Ladeira 1999	P	62	6 months	NA	N	13.4	average 24.8	I	NA

P – Prospective.

T – Transversal.

R – Retrospective.

N - Number of individuals.

Y – Yes.

N – No.

NA - Non available.

h - hours of exposure.

I – Individual.

NI - Non individual.