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Table 4 Number of items eliminated and cause for elimination

From: Patient reports of health outcome for adults living with sickle cell disease: development and testing of the ASCQ-Me item banks

   Cause for elimination  
Question set Original # of items Item-total correlation < 0.40 Simple structure violation Local dependence DIF Final # of items
Cognitive 28 5 3 5 0 15
Emotional 28 5 1 0 2 20
Pain 17 0 0 4 0 13
Sleep 20 2 0 4 2 12
Social 28 3 1 3 4 17
Stiffness 19 0 1 2 1 15