Study | Representativeness of the exposed cohort | Non-exposed cohort drawn from the same community | Ascertainment of exposure | Outcome of interest not present at start | Comparability of cohorts on the basis of design and analysis | Quality of outcome assessment | Follow-up long enough for outcomes to occur | Complete accounting for cohorts | Total score |
---|---|---|---|---|---|---|---|---|---|
Santoro [16] | * | * | * | * | * | * | – | * | 7 |
Amoozgar [17] | * | * | * | * | * | * | – | * | 7 |
McMullan [18] | * | * | * | * | * | * | – | * | 7 |
Mallula [19] | * | * | * | * | * | * | * | * | 8 |
Glatz [20] | * | * | * | * | ** | * | – | – | 7 |
Bentham [21] | * | * | * | * | ** | * | * | * | 9 |