Table 3

Risk of bias summary table
EN Author Year Adequate sequence generation? Allocation concealment? Blinding? Incomplete outcome data addressed Are typical outcomers reported? (Selective outcome reporting)
675 Brown 2007 ? ? YES YES YES
818 Daly 1996 ? ? ? YES YES
951 Faber 2005 NO NO` YES NO YES
1058 Gibson 2011 ? ? YES NO YES
153 Gill 1997 ? YES NO NO YES
1051 Lartey 1999 ? YES NO YES YES
1154 Liu 1993 ? ? ? NO YES
257 Maldonado Lonzano 2007 YES YES YES YES NO
282 Morley 1999 ? YES YES YES YES
1149 Nesamvuni 2005 NO NO YES YES YES
297 Oelofse 2003 NO NO NO NO YES
333 Rivera 2010 ? ? YES NO NO
1 Sazawal 2010 YES YES YES NO YES
1172.2 Schumann 2005 NO NO YES YES NO
838 Stevens 1998 ? ? YES NO NO
403 Villalpando 2006 ? ? YES YES NO
404 Virtanen 2001 ? ? YES NO NO
797 Walter 1998 NO YES YES NO YES

The table presents each study by assessed methodological criterion in a cross-tabulation a. Studies are sorted for author name.

a Assessment categories: YES: criterion fulfilled; NO: criterion not fulfilled; “?”: unclear, as no information given.

Eichler et al.

Eichler et al. BMC Public Health 2012 12:506   doi:10.1186/1471-2458-12-506

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