title: Be wary of methodology and biases in reading contraceptive failure rates.
mesh_terms: D015982:Bias; D003267:Contraception; D003268:Contraception Behavior; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D015203:Reproducibility of Results; D012106:Research; D012107:Research Design
keywords: Bias; Contraception; Contraception Failure; Contraceptive Effectiveness; Contraceptive Usage; Error Sources; Evaluation; Family Planning; Measurement; Pearl's Formula; Qualitative Evaluation; Reliability; Research Methodology; Use-effectiveness