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Table 1 Criteria of high, moderate and low study quality

From: Cardiac implications of hypoglycaemia in patients with diabetes – a systematic review

Study quality Criteria
High: small risk of bias Prospective study design and the following:
- Adequately described patients constituting a representative and clinically relevant sample
- Sample size ≥ 5000
Moderate: moderate risk of bias Prospective study design
Low: high risk of selection and/or verification bias Retrospective study design
Selected or enriched samples