Study | Representative-ness of the sample | Sample size | Non-respondents | Ascertainment of the exposure | Comparability | Assessment of the outcome | Statistical test |
---|---|---|---|---|---|---|---|
Cheng, 2014 | - | * | - | ** | -- | * | * |
Cho, 2008 | * | * | - | ** | -- | * | * |
Dalbudak, 2014 | * | * | - | ** | -- | * | * |
Dalbudak, 2015 | * | * | - | ** | -- | * | * |
Hyun, 2015 | - | * | * | ** | -- | * | * |
Jelenchick, 2014 | - | * | - | ** | -- | * | * |
Ko, 2008 | - | * | - | ** | -- | * | * |
Metin, 2015 | - | * | - | ** | -- | * | * |
Sofia, 2016 | - | * | - | ** | -- | * | * |
Yen, 2007 | * | * | * | ** | -- | * | * |
Yen, 2009 | * | * | - | ** | -- | * | * |
Yen, 2016 | - | * | - | ** | -- | * | * |
Yoo, 2004 | - | * | - | ** | -- | * | * |