Results:<br>- There was a significant inverse correlation between NQ scores and PETCO2 (P=−0.783). <br>- Cronbach's alpha coefficient was greater than 0.7 (P=0.702). <br>- The questionnaire had a good stability in an interval of 5 to 10 days (P=0.826). <br>- The NQ had no floor and ceiling effect. <br>- Factor analysis of 16 scales showed that this questionnaire has a five-factor structure
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