Table 2 The methodological quality of included studies based on the Cochrane handbook
Study | A | B | C | D | E | F | Total |
|---|---|---|---|---|---|---|---|
Toyokur 1985 17 | + | − | + | − | ? | + | 3 |
Olanow 1994 18 | ? | − | + | − | + | − | 2 |
Steiger 1996 19 | ? | + | + | − | ? | − | 3 |
Hutton 1996 20 | ? | − | + | − | + | + | 3 |
Rascol 1996 21 | − | − | + | − | ? | ? | 1 |
Lieberman 1997 22 | ? | − | + | − | + | + | 3 |
Guttman 1997 23 | ? | − | + | + | ? | + | 3 |
Wermuth 1998 24 | + | − | + | − | + | ? | 3 |
Lieberman 1998 25 | + | − | + | − | + | + | 4 |
Pinter 1999 26 | + | − | + | + | ? | + | 4 |
Stocchi 2002 27 | ? | − | − | + | + | + | 3 |
Nyholm 2005 28 | + | + | + | − | + | + | 5 |
Moller 2005 29 | + | − | + | − | ? | + | 3 |
Peter 2007 30 | + | + | + | − | + | + | 5 |
Poewe 2007 31 | ? | + | + | − | + | + | 4 |
R. Pahwa, 2007 32 | + | ? | + | − | + | + | 4 |
Hauser 2009 33 | + | − | + | − | + | + | 4 |
Pablo 2011 34 | + | − | − | ? | + | − | 2 |
Schapira 2011 35 | − | ? | + | ? | + | + | 3 |
Olanow 2014 36 | + | + | + | + | + | + | 6 |
