Spss statistics package v 25

Descriptive statistics were used for demographics. Normality of the data was
evaluated with the Shapiro–Wilk test. For normally distributed data, mean  $\pm$  SD was presented, while for skewed data, median  $\pm$  interquartile
range (IQR) was used. $T$  test was utilised for comparing groups of normally
distributed data and the non-parametric Mann–Whitney $U$  test otherwise. Chi-squared test was used for categorical data analysis. Regression analysis was
used for testing the hypothesis of whether infection had an effect on Barthel
index score. Except infection, the variables tested included age, sex,
smoking, dementia, diabetes mellitus, previous accommodation, previous
mobilisation status, use of anti-coagulants, haemoglobin, albumin, ASA score,
fracture type, method of fixation, length of stay, operative time and waiting
time until surgery. Finally, logistic regression analysis was employed for
the search of any predisposing factors to infection among the same
variables. SPSS statistics package v.25 (IBM, Armonk, New York, USA) was used for statistical
analyses.