Table 3

 Modified RCGP three star system

Source of evidence
***Strong evidenceProvided by generally consistent findings in multiple, high quality scientific studies
**Moderate evidenceProvided by generally consistent findings in fewer, smaller, or lower quality scientific studies
*Limited or contradictory evidenceProvided by one scientific study or inconsistent findings in multiple scientific studies
No scientific evidenceBased on clinical studies, theoretical considerations, and/or clinical consensus