Summary descriptives table by groups of ‘anaemic’
Non-anaemics N=545 Anaemics N=138 P
Gender: 0.253
    Female 328 (60.2%) 91 (65.9%)
    Male 217 (39.8%) 47 (34.1%)
Age group: <0.001
    <65 193 (35.4%) 24 (17.4%)
    65-75 206 (37.8%) 53 (38.4%)
    >75 146 (26.8%) 61 (44.2%)
Site: 0.007
    Hip 212 (38.9%) 36 (26.1%)
    Knee 333 (61.1%) 102 (73.9%)
Transfusion: <0.001
    No 531 (97.8%) 102 (73.9%)
    Yes 12 (2.21%) 36 (26.1%)
LOS 4.00 [3.00;6.00] 6.00 [4.00;8.00] <0.001
Statistical analysis was performed using Mann-Whitney test for length of stay and Chi-square test for independence for all the remaining comparisons Statistical analysis was performed using Mann-Whitney test for length of stay and Chi-square test for independence for all the remaining comparisons Statistical analysis was performed using Mann-Whitney test for length of stay and Chi-square test for independence for all the remaining comparisons Statistical analysis was performed using Mann-Whitney test for length of stay and Chi-square test for independence for all the remaining comparisons