Table 1 Results of subgroup analysis for pooled cumulative survival among patients who underwent prone positioning
Subgroup | No. of studies | Pooled proportion survived/% | 95% CI | p value for interaction |
|---|---|---|---|---|
Study population | ||||
 Non-COVID-19 | 8 | 64 | 51.7–75.9 | 0.24 |
 COVID-19 | 3 | 37 | 4.0–78.7 |  |
Proning initiation | ||||
  < 5D ECMO | 3 | 55 | 27.4–81.2 | 0.21 |
  > 5D ECMO | 3 | 78 | 55.1–95.1 |  |
ECMO duration | ||||
  < 14D | 3 | 33 | 16.3–51.9 | 0.0002 |
  > 14D | 7 | 71 | 63.8–78.5 |  |
Proning regimen | ||||
 Fixed duration | 4 | 73 | 55.4–87.5 | 0.12 |
 "As tolerated" | 6 | 54 | 36.9–70.0 |  |
JBI score | ||||
 100% | 6 | 61 | 40.3–79.5 | 0.57 |
 < 100% | 5 | 52 | 30.4–73.4 |  |