《Table 6 Correlation between MW and n-back accuracy, NASA-TLX scores, Physiological indexes》

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《Comprehensive Assessment of Pilot Mental Workload in Various Levels》

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*Correlation is significant at the 0.05 level（2-tailed）；**Correlation is significant at the 0.01 level（2-tailed）.

As show n in Table 6，as expected，the NASA-TLX sores w ere significantly correlated w ith M WL（r=0.92，P<0.001）.Here we made a hypothesis that w e quantify M WL as linear number 0，1，2 and3.And then a linear regression analysis w as carried out w ith NASA-TLX scores as the independent variable and M W as the dependent variable.The results show ed that NASA-TLX scale can predict84.3%of the M WLs w ith a good model fit（F （1，46）=252.721，P<0.001） .Performance index w as negative correlated w ith M WL，further regression analysis indicated the N-back accuracy can only predict 35.8%of the M WL w ith a good model fit（F （1，46）=27.257，P<0.001） .