Skip to main content

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