Study | Clear focus of research | Appropriate method of measurement | Acceptable recruitment of cases | Acceptable selection of controls | Accurate measurement of exposure | Equal treatment of groups | Identification and consideration of confounding factors | Size of treatment effect | Precision of estimate | Believability of results | Local application | Confirms available research |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Berry 2013 | Yes | Yes | Yes | Unknown | Yes | Yes | Yes | OR 1.47 | CI95* 1.24–1.74 | Yes | Unknown | Yes |
Chang 2011 | Yes | Yes | Yes | No | Yes | Yes | No | OR 2.38 | CI95 1.04–5.43 | No | Unknown | Yes |
Kang 2012 | Yes | Yes | Yes | Unknown | Yes | Yes | Yes | OR 1.84 | CI95 1.47–2.3 | Yes | Unknown | Partially |
Lai 2015 | Yes | Yes | Yes | No | Yes | Yes | No | OR 3.87 | CI95 2.71–5.53 | No | Unknown | Yes |
Pierfitte 2001 | Yes | Yes | Yes | No | Yes | Yes | No | OR 1.3 | CI95 0.7–2.5 | Yes | Yes | Yes |
Tang 2015 | Yes | Yes | Yes | Unknown | Yes | Yes | Yes | OR 1.23 | CI95 1.06–1.44 | Yes | Unknown | Yes |
Tom 2016 | Yes | Yes | Yes | Unknown | Yes | Yes | Yes | OR 1.87 | CI95 1.56–2.25 | Yes | Unknown | Yes |
Wang 2001 | Yes | Yes | Yes | No | Yes | Yes | No | OR 2.26 | CI95 1.28–3.97 | No | Unknown | Yes |
Zint 2010 | Yes | Yes | Yes | No | Yes | Yes | No | RR 1.48 | CI95 1.32–1.66 | No | Yes | Yes |