- Cohort Studies:
- ∙ Low quality: studies meeting up to 3 items.
- ∙ Moderate quality: studies meeting 4–7 items.
- ∙ High quality: Studies meeting 8–11 items.
- Cross-sectional studies:
- ∙ Low quality: studies meeting up to 3 items
- ∙ Moderate quality: studies meeting 4–6 items.
- ∙ High quality: studies meeting 7–8 items.