Table 2 Newcastle–Ottawa scale qualitative analysis
| Â | Â | Selection | Comparability | Outcome | Â | |||||
|---|---|---|---|---|---|---|---|---|---|---|
Cohort/case series | ||||||||||
Author and year | Study type | Representativeness of the exposed cohort | Selection of the non-exposed cohort | Ascertainment of exposure | Demonstration that outcome of interest was not present at start of study | Comparability of cohorts on the basis of the design or analysis | Assessment of outcome | Was follow-up long enough for outcomes to occur | Adequacy of follow up of cohorts | Total |
Meyer [15] | RC | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 6 |
Zamanzadeh [20] | RC | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
Kyaw [16] | RC | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 6 |
Tram [17] | RC | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 6 |
Raad [18] | RC | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |
Traven [19] | RC | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |
Momtaz [21] | RC | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 7 |