Table 3

Mean movement (mm)

Vacuum mattressBackboardDifferencep Value95% CI
Head up6.6623.3016.64<0.019.61 to 38.78
Head down8.3340.8932.56<0.0115.90 to 69.20
Lateral tilt4.2618.3314.07<0.016.66 to 29.42