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Table 2 Narcolepsy severity scale items-Factor analysis

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

ItemsCommunlitiesFactors
 IIIIII
10.334 0.457 
20.520 0.711 
30.776 0.845 
40.515 0.573 
50.478 0.412 
60.368 0.600 
70.257 0.462 
Cronbach’ α0.697
80.727  0.837
90.691  0.794
100.563  0.629
150.296  0.379
Cronbach’ α0.740
110.6300.775  
120.7590.859  
130.5960.767  
140.6920.814  
Cronbach’ α0.817
KMOa measure of sampling adequacy0.728
Percentage of cumulative variance explained0.55
  1. aKMO Kaiser-Meyer-Olkin