|
Study ID (author, year)
|
Clarity
|
External validity
|
Internal validity
|
Total score
|
|---|
| | | |
Bias
|
Confounding
| |
|---|
|
Alin Akerman 1995 [18]
|
4
|
2
|
5
|
2
|
13
|
|
Bergvall 2007 [19]
|
5
|
2
|
5
|
3
|
15
|
|
Cnattingius 2009 [20]
|
5
|
2
|
5
|
3
|
15
|
|
De Zeeuw 2012 [21]
|
4
|
2
|
5
|
2
|
13
|
|
Groen-Blokhuis 2011 [22]
|
3
|
2
|
5
|
2
|
12
|
|
Hestbaek 2003 [23]
|
4
|
2
|
5
|
2
|
13
|
|
Hultman 2007 [24]
|
4
|
2
|
5
|
3
|
14
|
|
Gardner 1995 [25]
|
3
|
2
|
5
|
2
|
12
|
|
Ortqvist 2009 [11]
|
5
|
2
|
5
|
3
|
15
|
|
Rasanen 2000 [26]
|
5
|
2
|
5
|
3
|
15
|
|
Suvanand 1997 [27]
|
3
|
2
|
5
|
3
|
15
|
|
Villamor 2009 [28]
|
5
|
2
|
5
|
3
|
15
|
|
Williams 1996 [29]
|
4
|
2
|
5
|
3
|
14
|
|
Yokoyama 2007 [30]
|
5
|
2
|
4
|
3
|
14
|
|
Median (range)
|
4 (3-5)
|
2 (2-2)
|
5 (4-5)
|
3 (2-3)
|
13.5 (12-15)
|
