Study | Reporting quality | Internal validity | External validity |
---|---|---|---|
Betschon et al., 2014 [45] | HR | HR | HR |
Buge & Mahler, 2004 [50] | LR | HR | LR |
Christen et al., 2002 [46] | UR | HR | HR |
Eisenschink et al., 2003 [47] | HR | UR | HR |
Friess-Ott & Müller, 2006 [53] | HR | HR | HR |
Hock-Rummelhardt, 2013 [57] | LR | HR | HR |
Huth et al., 2013 [55] | LR | LR | NA |
Lenker, 2008 [51] | HR | HR | HR |
Maietta & Resch-Kröll, 2009 [49] | HR | HR | HR |
Rettenberger & Schoenemeier, 2005 [52] | HR | HR | HR |
Sedlak-Emperer, 2012 [56] | UR | HR | LR |
Steinwidder & Lohrmann, 2008 [54] | HR | HR | UR |
Tamminen-Peter, 2006 [48] | UR | HR | HR |