Table 4 Methodological quality criteria in prospective controlled studies
Reference | Eriksson S 1995 | Turhan A 2009 | Hansson J 2012 |
|---|---|---|---|
Patient selection | |||
Representativeness | 1 | 1 | 1 |
Selection of the non-exposed cohort | 1 | 1 | 1 |
Ascertainment of exposure | 0 | 1 | 1 |
Demonstration that outcome of interest was not present at start of study | 1 | 0 | 1 |
Comparability | |||
Most important factor | 1 | 1 | 1 |
Other additional factor | 0 | 0 | |
Outcome | |||
Assessment | 0 | 0 | 1 |
Follow-up long enough for outcomes to occur | 0 | 1 | 1 |
Adequacy of follow-up | 1 | 1 | 0 |
Aggregate score | 5 | 6 | 7 |