Table 3 Quality of bias assessment of the included studies according to the Cochrane guidelines
Study | Random sequence generation | Allocation concealment | Selective reporting | Other bias | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data |
|---|---|---|---|---|---|---|---|
Athyros et al. (2002) [52] | L | U | L | L | H | U | L |
Bredie et al. (1996) [55] | U | U | L | L | U | U | L |
Hansen et al. (1994) [60] | U | U | L | L | H | U | L |
Perez-Jimenez et al. (1995) [61] | U | U | L | U | H | U | L |
Melenovsky et al. (2002) [51] | H | U | L | U | H | U | L |
Ohrvall et al. (1995) [54] | U | U | L | L | U | U | U |
Ramires et al. (1995) [62] | U | U | L | H | H | U | U |
Bairaktari et al. (1999) [50] | H | U | L | U | U | U | L |
Davidson et al. (2009) [53] | L | L | L | L | L | L | L |
Greten et al. (1994) [64] | U | U | L | U | U | U | L |
Kehely et al. (1995) [56] | U | U | L | L | U | U | L |
May et al. (2008) [57] | L | U | L | U | L | U | U |
Ramires et al. (1997) [63] | U | U | L | U | U | U | L |
Saougos et al. (2007) [65] | H | U | L | U | U | U | L |
Vigna et al. (1999) [58] | U | U | L | U | U | U | L |
de Lorgeril et al. (1999) [59] | U | U | U | U | U | U | U |