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Table 2 Risk of bias assessment of the included studies

From: Progesterone vs. synthetic progestins and the risk of breast cancer: a systematic review and meta-analysis

Study Representativeness of the exposed cohort Selection of the non-exposed cohort Ascertainment of exposure Outcome of interest was not present at start of study Comparability of cohorts Assessment of outcome Adequacy of follow-up cohort
Espie et al. 2007 [16] Somehow representative Drawn from the same community No description Yes Study control for most important factors No description Yes
Fournier et al. 2008 [8] Somehow representative Drawn from the same community Written self-report questionnaires Yes Study control for most important factors Self-report questionnaires or files of health insurance plan. (Pathology reports were obtained in 96 % of cases) Yes