Table 4.

Results of the hypotheses

Source	Population	Design	ERI risk predictor	ERI hypothesis	OVC risk predictor	OVC hypothesis	ERI*OVC risk predictor	ERI*OVC hypothesis	Quality
Herin et al., 2011 [25]	Health care workers	C-S	+	↑					High
van Vegchel et al., 2002 [21]		C-S	+	↑					Moderate
Weyers, 2006 [23]		C-S	+	↑	-	↓	+	↑	High
Simon et al., 2008 [26]		C-S	+ + +	↑					High
Gillen et al., 2007 [39]		C-C	+	↑					Moderate
Joksimovic et al., 2002 [27]	Passenger transport companies	C-S	- - - + - -	↓	+ - - + - +	↑			High
Dragano et al., 2003 [28]		C-S	- - + +	↑	- + - -	↓			High
Rugulies et al.,2007		PC	+ +	↑					High
Peter et al., 1998 [29]		C-S	+ - -	↓					Moderate
Lau, 2008 [22]	Public authorities	C-S	+	↑	+	↑	-	↓	High
Lapointe et al.,2012		PC	+ -	↑			-	↓	High
Taleb et al., 2005 [35]	Banks/insurance companies	C-S	-	↓	+ - - -	↓			High
de Jonge et al., 2000 [30]	Random sample from the general population	C-S	+	↑			-	↓	Moderate
Toivanen, 2011 [31]		C-S	+ +	↑					Moderate
Bernard et al., 2011 [32]	Vineyard workers	C-S	+ + - + - - - -	↓	- + + - - + - -	↓	-	↓	High
Tsutsumi et al., 2001 [24]	Dental technicians	C-S	-	↓	+	↑			High
Krause et al., 2010 [38]	Call centre operatives	PC	- + -	↓					High
Burgel et al., 2010 [33]	Cleaners	C-S	+	↑					High
von dem Knesebeck et al., 2005 [34]	Police officers	C-S	+ + - +	↑	+ + - -	↑			High

Legend: + = Positive statistically significant association, - = No statistically significant association, ↑= Hypothesis confirmed, ↓= Hypothesis not confirmed, C-S = Cross-sectional study, PC = Prospective cohort study, C-C = Case-control study.