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Table 2 Items of phase III and phase IV including difficulties, subdomains, item parameters, and fit indices

From: Development of an item bank for the EORTC Role Functioning Computer Adaptive Test (EORTC RF-CAT)

Item Difficulty rating RF aspects Slope Location Bias Item fit p-value Infit Outfit
Item 1: Have you been limited in completing your household tasks? Moderate Work/activities 2.731 −0.784 0.02 0.651 0.95 0.73
Item 2: Have you been limited in doing light housework (e.g. dusting or making the bed)? Difficult Work/activities 3.093 −1.059 0.01 0.836 0.94 0.60
Item 3: Have you been limited in doing physically demanding recreational activities (e.g., swimming or cycling)? Easy Hobby/leisure 1.907 −0.259 0.03 0.331 0.95 0.79
Item 4: Have you needed assistance in doing your work or daily activities? Moderate Work/activities 2.736 −1.019 0.01 0.857 0.93 0.68
Item 5: Have you been limited in doing light recreational activities (e.g., watching TV, playing cards, or reading)?a Difficult Hobby/leisure 1.986 −1.346 0.00 0.084 1.03 0.66
Item 6: Have you been limited in doing minor household repairs and maintenance (e.g., changing a light bulb or hanging up a picture)? Moderate Work/activities 2.169 −1.062 0.01 0.401 0.96 0.68
Item 7: Have you been limited in taking care of personal or household financial affairs (e.g. paying bills)?ab Difficult Work/activities 1.659 −1.313 0.01 0.744 0.99 0.93
Item 8: Were you limited in doing either your work or other daily activities?bc Easy Work/activities 3.578 −0.867 0.01 0.821 0.91 0.62
Item 9: Have you been limited in doing heavy housework (e.g., washing floors or vacuuming)?b Easy Work/activities 3.746 −0.470 0.02 0.098 0.90 0.59
Item 10: Were you limited in pursuing your hobbies or other leisure time activities?bc Easy Hobby/leisure 2.144 −0.666 0.02 0.211 0.96 0.78
Item 11: Have you been limited in doing your work around the house? Moderate Work/activities Excluded in phase IV
Item 12: Have you been limited in doing the necessary shopping (e.g., for groceries or clothes)? Moderate Work/activities Excluded in phase IV
  1. afour response categories collapsed to two
  2. bsignificant DIF (item 7: age – higher RF >60 years,item 8: work – higher RF when retired; partner – higher RF if no partner,item 9: country – higher RF in UK + Austria, item 10: gender – higher RF in women,)
  3. cQLQ-C30 item