The midwife uses a hierarchical rating system to classify evidence. Which type of evidence does the midwife consider to be least rigorous?

Question

Quizplus · Accepted Answer

According to Harris et al. (2001), evidence from multiple time series with or without the intervention is included among the least rigorous form of evidence (Level II.3). More rigorous forms of evidence include well-designed controlled trials without randomization (Level II.1), followed by well-designed cohort or case-control analytic studies (Level II.2).

The Midwife Uses a Hierarchical Rating System to Classify Evidence