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 (−).