Selection | Comparability | Outcomes | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 1 | 1 | 2 | ||||
Paper | Representativeness of sample | Sample size | Non-respondents | Ascertainment of exposure | Total Selection Score/5 | Comparability of different groups | Total Comparability Score | Assessment of outcome | Statistical test | Total Outcomes Score/2 |
Aggar 2012* [25] | (c) | (a)* | (a)* | (a)** | 4 | (a)* | 1 | (c) | (a)* | 1 |
Comans 2011* [27] | (c) | (b) | (c) | (a)** | 2 | (a)* | 1 | (c) | (a)* | 1 |
Cullen 1997 [28] | (b)* | (b) | (a)* | (a)** | 4 | (a)* | 1 | (c) | (a)* | 1 |
Kim 2008 [30] | (a)* | (a)* | (c) | (b) | 2 | (a)* | 1 | (c) | (a)* | 1 |