Respiratory muscle function
The baseline MIP, adjusted for age and gender, was comparable between the two groups and was reduced as compared to their expected baseline values (Table Hip replacement surgery under GA was associated with a decrease in MIP, as compared to their baseline value, by a mean 12.24%, (SD 19.95%) on postoperative day 1, whereas MIP increased in the SA group by 11.72% (SD 48.30%) (The evolution over time of changes in MIP and the effect of type of anaesthesia. Mean and standard deviation of MIP are shown on different time points as a percentage relative to baseline being the preoperative values and this for the different types of anaesthesia. P-values indicate the relative difference between the two types of anaesthesia on the different time points. 