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Table 1 Item-total score correlations and Cronbach’s Alpha of NSS a

From: Chinese version of narcolepsy severity scale: a validation study

Dimensions and itemsItem-total score correlation
Spearman correlation coefficientsignificance
Item 10.361p < 0.001
Item 20.440p < 0.001
Item 30.630p < 0.001
Item 40.532p < 0.001
Item 50.242p = 0.007
Item 60.400p < 0.001
Item 70.342p < 0.001
Item 80.603p < 0.001
Item 90.655p < 0.001
Item 100.616p < 0.001
Item 110.611p < 0.001
Item 120.677p < 0.001
Item 130.542p < 0.001
Item 140.632p < 0.001
Item 150.455p < 0.001
Cronbach’s α of the NSS0.799
Alfa Cronbach global split-half coeficients0.6570.774
  1. a NSS narcolepsy severity scale