Item analysis on the quality of life scale for anxiety disorders QLICD-AD(V2.0) based on classical test theory and item response theory

Table 6 CTT and IRT unlisted items summary

Items	CTT				IRT			Total
Items	Variability	Correlation coefficient	EFA	Cronbach’s α	Discrimination	difficulty coefficient	Average information	Total
GPH1	✓	X	X	✓	✓	✓	X	E
GPH2	✓	X	X	✓	✓	✓	✓	E
GPH4	✓	X	X	✓	✓	✓	✓	E
GPH6	✓	X	✓	✓	X	X	X	D
GPH8	✓	✓	X	✓	✓	X	X	E
GPS3	✓	X	✓	X	X	X	X	D
GPS10	✓	X	✓	X	✓	✓	✓	E
GSO2	✓	✓	X	✓	✓	X	X	E
GSO3	✓	✓	X	✓	✓	X	✓	E
GSO4	✓	X	X	✓	✓	X	✓	E
GSO6	✓	X	X	X	✓	✓	✓	E
AD2	✓	✓	X	✓	✓	X	✓	E
AD5	✓	✓	X	✓	✓	X	✓	E

ISSN: 1744-859X