Figure 2From: Development and validation of a quality of life questionnaire for patients with colostomy or ileostomy Stoma-QOL Item Calibration of the items located within the spread of the person measures. (logit scores, the measurement unit common to both patients and items, are displayed down the middle of the map; patient, represented by a single dot, are arranged within the scale from better (top) to worse (down) quality of life; items are identified by the item number)Back to article page