From: Statistical analyses of ordinal outcomes in randomised controlled trials: a scoping review
Design | Studies―n (%) |
---|---|
Type of ordinal scale used―n (%) |  |
- Single-state scale | 128 (89%) |
- Transition-state scale | 16 (11%) |
Type of outcome―n (%) |  |
- Primary outcome | 59 (41%) |
- Secondary outcome | 85 (59%) |
Type of outcome measure―n (%) |  |
- Clinical outcomes | 130 (90%) |
- Life impact | 11 (8%) |
- Physiological outcome | 1 (1%) |
- Adverse event | 1 (1%) |
- Other | 1 (1%) |
Target parameter(s)―n (%)a |  |
- Odds ratio | 78 (54%) |
- Risk difference | 31 (22%) |
- Non-parametric procedure used | 19 (13%) |
- Risk ratio | 13 (9%) |
- Difference in means | 11 (8%) |
- Difference in medians | 8 (6%) |
- Other | 8 (6%) |
- Descriptive analysis only | 6 (4%) |
- Unknown | 4 (3%) |
A priori sample size based on the ordinal outcome―n (%)a | 32 |
- Analytical | 26 (81%) |
- Simulation†| 6 (19%) |
Scale dichotomised for analysis―n (%) | 47 (33%) |
No. of categories in ordinal outcome―median (IQR, range) | 7 (6–7; 3–23) |