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Table 2 Study types extracted

From: Study filters for non-randomized studies of interventions consistently lacked sensitivity upon external validation

Coding Terms (following Hartling et al. [10])
1 Randomized controlled trial (RCT)
2 Non-randomized controlled trial (NRCT)a)
3 Controlled before-after study
4 Interrupted time series (with comparison group)
5 Prospective cohort study
6 Retrospective cohort study
7 Non-concurrent cohort study
8 (Nested) case-control study
9 Cross-sectional study
10 Non-comparative study (e.g. case report or case series)
11 Before-after study
12 Interrupted time series (without comparison group)
  1. a)Also refers to quasi-randomized controlled trial and controlled clinical trial