Table 2 |
||||||||||||||||||||
| Quality scores of included studies | ||||||||||||||||||||
| Reference number | Year | External validity | Internal validity | Informativity | Disagree | |||||||||||||||
| a | b | c | d | e | sum | f | g | h | i | j | sum | k | l | m | n | o | sum | |||
| Questionnaire studies | ||||||||||||||||||||
| [23] | 2008 | 0 | 1 | 1 | 0 | 1 | 3 | 1 | 0 | 1 | 1 | 1 | 4 | 1 | 1 | 1 | 1 | 1 | 5 | d,f,h |
| [18] | 2008 | 0 | 0 | 0 | 1 | 1 | 2 | 1 | 0 | 1 | 1 | 0 | 3 | 1 | 1 | 1 | 1 | 1 | 5 | g |
| [26] | 2008 | 1 | 1 | 0 | 1 | 0 | 3 | 1 | 0 | 0 | 1 | 1 | 3 | 1 | 1 | 1 | 0 | 0 | 3 | n |
| [17] | 2007 | 1 | 1 | 0 | 0 | 0 | 2 | 1 | 1 | 0 | 1 | 0 | 3 | 1 | 1 | 1 | 0 | 0 | 3 | d,n |
| [7] | 2005 | 1 | 1 | 1 | 1 | 0 | 4 | 1 | 1 | 0 | 1 | 1 | 4 | 1 | 1 | 1 | 1 | 1 | 5 | |
| [6] | 2003 | 0 | 1 | 1 | 1 | 0 | 3 | 1 | 0 | 0 | 1 | 1 | 3 | 0 | 1 | 1 | 1 | 1 | 4 | |
| [15]i | 2002 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 2 | 0 | 1 | 1 | 0 | 0 | 2 | d,k |
| [16] | 1998 | 1 | 1 | 0 | 1 | 0 | 3 | 1 | 1 | 0 | 1 | 0 | 3 | 1 | 1 | 1 | 1 | 1 | 5 | |
| [20] | 1996 | 1 | 1 | 1 | 1 | 1 | 5 | 1 | 1 | 1 | 1 | 1 | 5 | 0 | 1 | 1 | 1 | 1 | 4 | i |
| [25] | 1996 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 3 | 0 | 1 | 1 | 1 | 1 | 4 | d |
| [19] | 1995 | 1 | 1 | 1 | 1 | 1 | 5 | 1 | 0 | 1 | 1 | 1 | 4 | 0 | 1 | 1 | 1 | 1 | 4 | l,o |
| [22] | 1995 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 3 | 1 | 1 | 0 | 1 | 1 | 4 | i,m |
| Database studiesii | ||||||||||||||||||||
| [14] | 2006 | 1 | 1 | - | 0 | 1 | 3 | 0 | - | - | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 5 | d |
| [24] | 2000 | 1 | 1 | - | 1 | 1 | 4 | 0 | - | - | 1 | 1 | 2 | 0 | 1 | 1 | 1 | 1 | 4 | |
| [21] | 1998 | 1 | 1 | - | 0 | 1 | 3 | 0 | - | - | 1 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 5 | |
i Abstract only.
ii Categories c, g and h did not apply to database studies (−).
Van der Meer et al. BMC Family Practice 2012 13:100 doi:10.1186/1471-2296-13-100
