Table 2 The quality assessment of the included studies based on scores of Newcastle-Ottawa Scale
Author | Public Year | Representativeness of the cases | Case definition adequate | Ascertainment of exposure | Same method of ascertainment for cases and controls | Control for important factor or additional factor | Selection of controls | Definition of controls | Non-response rate | Total quality scores |
|---|---|---|---|---|---|---|---|---|---|---|
Bernard N | 2007 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 6 |
Lin H | 2014 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 6 |
Ríosgonzález BE | 2014 | 1 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 5 |
Yin RX | 2012 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |