Table 2 Results of methodological assessment of the 49 included studies
Author and year of publication | Study participation | Study attrition | Prognostic factor measurement | Outcome measurement | Analysis/reporting of results | Risk of bias assessment |
|---|---|---|---|---|---|---|
Albert et al. (2012) [25] | Yes | Unsure | Yes | Yes | Yes | Low |
Amundsen et al. (2000) [26] | Unsure | Partly | Unsure | No | No | High |
Bendix et al. (1998) [27] | Yes | Partly | Unsure | Yes | Partly | Moderate |
Bergquist-Ullman et al. (1977) [28] | Yes | Unsure | Yes | Yes | Partly | Moderate |
Burton et al. (1991) [29] | Yes | Partly | No | No | Partly | High |
Burton et al. (1995) [30] | Yes | Yes | No | Yes | Partly | Moderate |
Campello et al. (2006) [31] | No | Yes | Partly | Yes | Yes | Moderate |
Christiansen et al. (2010) [32] | Yes | Yes | Yes | Yes | Yes | Low |
Coste et al. (1994) [33] | Yes | Unsure | Unsure | Unsure | Partly | High |
Dwornik et al. (2007) [34] | Unsure | Unsure | Unsure | Partly | No | High |
Enthoven et al. (2003) [35] | Yes | Partly | Yes | Yes | Yes | Low |
Ferreira et al. (2009) [36] | Partly | Unsure | Yes | Yes | Yes | Moderate |
Flynn et al. (2002) [37] | Yes | Yes | Yes | Partly | Yes | Low |
Fritz et al. (2004) [40] | Yes | Yes | Yes | Partly | Yes | Low |
Fritz et al. (2007) [38] | Unsure | Yes | Yes | Yes | Yes | Low |
Fritz et al. (2005) [39] | Yes | Yes | Yes | Yes | Yes | Low |
Gaines et al. (1999) [41] | Yes | Unsure | Yes | Partly | Yes | Moderate |
Ghahreman et al. (2011) [42] | Yes | Unsure | Unsure | Yes | Partly | High |
Grotle et al. (2005) [44] | Unsure | Yes | Unsure | Yes | Partly | Moderate |
Grotle et al. (2007) [43] | Unsure | Yes | Unsure | Yes | Partly | Moderate |
Gurcay et al. (2009) [45] | Partly | Yes | Unsure | Yes | Partly | Moderate |
Hicks et al. (2005) [46] | Unsure | Yes | Yes | Yes | Yes | Low |
Hildebrandt et al. (1997) [47] | Partly | Yes | Unsure | Partly | Partly | High |
Hurri et al. (1989) [48] | No | Partly | Unsure | Yes | Yes | High |
Indahl et al. (1998) [49] | Unsure | Yes | Partly | Unsure | Partly | High |
Infante-Rivard et al. (1996) [50] | Yes | Partly | No | Unsure | Yes | High |
Jamison et al. (1991) [51] | Unsure | No | Unsure | Yes | No | High |
Karas et al. (1997) [52] | Yes | Partly | Yes | Yes | Yes | Low |
Kool et al. (2002) [53] | Unsure | Yes | Yes | Partly | Yes | Moderate |
Leboeuf-Yde et al. (2004) [54] | Yes | Partly | Unsure | Yes | Yes | Low |
Long et al. (1995) [55] | Yes | Unsure | Yes | Partly | Partly | High |
Lonnberg (2010) [56] | Unsure | Unsure | Unsure | Yes | Yes | High* |
Luoto et al. (1998) [57] | Unsure | Yes | No | No | No | High |
McIntosh et al. (2000) [58] | Unsure | Yes | Unsure | Yes | Yes | Moderate |
Milhous et al. (1989) [60] | No | Partly | No | Partly | No | High |
Michaelson et al. (2004) [59] | Yes | Yes | Partly | Yes | Yes | Low |
Pedersen (1980) [61] | Yes | Yes | Yes | Unsure | No | High |
Polatin et al. (1989) [62] | Unsure | Unsure | Unsure | Yes | Partly | High |
Roland (1983) [63] | Unsure | Yes | Yes | Unsure | No | High |
Sandström et al. (1986) [64] | Yes | Yes | Partly | Yes | No | High |
Schiøtt-Christensen et a (1999) [65] | Yes | Yes | Unsure | Yes | Yes | Low** Medium*** |
Seferlis et al. (2000) [66] | Unsure | Partly | Partly | Partly | Yes | High |
Skytte et al. (2005) [67] | Yes | Unsure | Yes | Yes | Partly | Moderate |
Sweetman et al. (1996) [68] | Unsure | Unsure | Unsure | Unsure | No | High |
Valls et al. (2001) [29] | Yes | Unsure | Unsure | Partly | Yes | Moderate |
Van den Hoogen et al. (1997) [70] | Yes | Partly | Yes | Yes | Yes | Low |
Vendrig et al. (1999) [71] | Yes | Partly | Unsure | Yes | No | High |
Vroomen et al. (2002) [72] | Unsure | Yes | Yes | Yes | Yes | Low |
Werneke et al. (1993) [73] | Yes | Unsure | Yes | Partly | Partly | High |