Summary descriptives table
[ALL] N=683
Gender:
    Female 419 (61.3%)
    Male 264 (38.7%)
Age group:
    <65 217 (31.8%)
    65-75 259 (37.9%)
    >75 207 (30.3%)
Site:
    Hip 248 (36.3%)
    Knee 435 (63.7%)
Anaemic:
    No 545 (79.8%)
    Yes 138 (20.2%)
Transfusions performed:
    No 633 (93.0%)
    Yes 48 (7.05%)
Length of stay 4.00 [3.00;7.00]