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.

Van der Meer et al. BMC Family Practice 2012 13:100   doi:10.1186/1471-2296-13-100

Open Data