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Table 4 Assessment for rating up the quality of evidence for individual observational studies

From: Effect of exogenous estrogens and progestogens on the course of migraine during reproductive age: a consensus statement by the European Headache Federation (EHF) and the European Society of Contraception and Reproductive Health (ESCRH)

  1. Criteria for rating up the quality of evidence from observational studies were selected and addresses according to the GRADE recommendations (Guyatt et al. [26]). The red dot indicates that the study does not meet quality of evidence criterion