Study designs used to measure defined outcomes
| Study design | Frequency |
|---|---|
| Interrupted time-series | 14 |
| Randomised controlled trial (RCT) | 1 |
| Single and multisite case study design | 19 |
| Longitudinal quasi-experimental | 1 |
| Longitudinal case study design | 2 |
| Case control study and Cohort designs | 5 |