Summary of evidence of PIP
| Intervention | Effect size | Comments |
| Pressure relief | RR 0.62 (95% CI 0.10 to 3.97, p value = 0.62)6 | Cochrane review showed limited evidence due to underpowered studies. RCT found no difference between 2, 3 or 4 hours repositioning7 |
| Specialised mattresses | (RR 0.40 95% CI 0.21 to 0.74)8 | Cochrane review showed high-quality evidence for the use of higher-specification foam mattresses or medical sheepskin |
| Dressing over bony prominences | RR 0.21 (95% CI 0.09 to 0.51; p value = 0.0006)9 | Cochrane review showed low-quality evidence with high or unclear risk of bias |
| Nutritional supports | RR 0.86 (95% CI 0.73 to 1.00; p value = 0.05)10 | Cochrane review showed low-quality evidence with high or unclear risk of bias |
| Use of skin moisturisers | RR 0.78 (95% CI 0.47 to 1.31; p value = 0.35)9 | Cochrane review showed low-quality evidence with high or unclear risk of bias |
PIP, pressure injury prevention; RCT, randomised controlled trial.