Title: Comparison of Two Measures of Physical Work Load in Hospital Personnel: a Cross-sectional Study

Authors in the presented manuscript concluded that number of patient handling tasks (PHT) is a more feasible measure of exposure when assessing the risk of LBP compared to more advanced measures of physical load on the lower lumbar spine. Present study involves different hospital wards (Orthopaedic and Psychiatric). By work profile in those wards should be different work demands (physical and psichological) as in Orthopaedic ward diversely from Psychiatric ward patients are with limited ability to move and it would require more physical work demands per patient(our expectations are confirmed also in table 3), eg Psychiatric ward is in different sittuation and we can expect that accordingly it would require more psichological work demands. As psichological work demands authors have presented as a part of study methodology, it would be beneficial to present in table 4 and 5 analysis of data comparing POR in wards to PHT, physical and psichological work demands.