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Table 3 Person mean values and Person Separation Index values for five item sets

From: Recent advances in analysis of differential item functioning in health research using the Rasch model

  Original
8 items
Resolving Stomach ache Resolving Stomach ache Low Resolving Stomach ache Low Headache Resolving Stomach ache Low Headache Irritable
Boys 1.064 1.065 1.025 0.997 0.914
Girls 0.486 0.541 0.563 0.591 0.555
Difference Boys-Girls 0.578 0.524 0.462 0.406 0.359
Person Separation Index 0.781 0.778 0.777 0.774 0.772