The key finding of this study is that there is no
agreement between results of the two methods. The
small Kappa coefficient (0.12) showed little
agreement between the results of REBA and QEC
methods. This is supported by the lack of
monotonicity (with a gamma score of 0.51) that is a
measure which indicates how well two variables
correlate. Motamedzade et al. compared the outputs
of QEC and REBA methods (23). The results
showed that regardless of task type, these methods’
estimations for posture-related risk were similar
(21). The correlation coefficients for QEC and
REBA outputs, including final scores (r = 0.73) and
action levels (r = 0.89), were computed, and a
considerable agreement was found between the
outputs of these two methods.