Table 4.

Assessment of the methodologic quality of the case-control studies included in meta-analysis

Studies	Slection				Comparability		Exposure			Total scores
	1	2	3	4	1	2	1	2	3
Hallas, J. 2012 [17]	+	+	+	+	+	+	+	+	+	9
Azoulay, L. 2012 [39]	+	+	+	+	+	+	+	+		8
Kemppainen, K. J. 2011 [15]	+	+	+		+	+	+	+		7
Assimes, T. L. 2008 [34]	+	+	+	+	+	+	+	+		8
Ronquist, G. 2004 [35]	+	+	+	+	+	+	+	+		8
Perron, L. 2004 [19]	+	+	+	+	+		+	+		7
Vezina, R. M. 1998 [36]	+	+	+	+	+	+	+	+		8
Rosenberg, L. 1998 [37]	+	+	+	+	+	+	+	+	+	9
Jick, H. 1997 [11]	+	+	+	+	+		+	+		7

+: the article gain 1 score in the item