Table 3 Methodological quality criteria in retrospective studies
Reference | Oliak D 2001 | Tingstedt B 2002 | Liu K 2007 |
|---|---|---|---|
Patient selection | |||
Definition adequate | 1 | 1 | 1 |
Representativeness | 1 | 1 | 1 |
Selection of controls | 0 | 0 | 0 |
Definition of controls | 1 | 1 | 1 |
Comparability | |||
Most important factor | 1 | 1 | 1 |
Other additional factor | 0 | 0 | 0 |
Exposure | |||
Ascertainment of exposure | 1 | 0 | 0 |
Same method of ascertainment for cases and controls | 1 | 1 | 1 |
Non-response rate | 0 | 0 | 0 |
Aggregate score | 6 | 5 | 5 |