Table 4 Newcastle-Ottawa Scale for cohort studies
| Â | Selection | Comparability | Outcome | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start | Study controls for relevant primary confounder | Study controls for other secondary confounders | Assessment of outcome | Was follow up long enough for outcomes to occur | Adequacy of follow up of cohorts | Total | |
Bell, et al. (1995) [35] | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 4 |
Collings, et al., (1983) [36] | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 6 |
Magann, et al. (2002) [37] | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 7 |
Hegaard, et al. (2010) [38] | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
Sternfeld, et al. (1995) [39] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |
Rose, et al. (1991) [40] | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 7 |
Hall, et al., (1987) [41] | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 7 |
McCowan, et al. (2010) [42] | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 9 |