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Table 1 Item analysis of all attitude, barriers, and norms items

From: Development of the Informed Choice in Mammography Screening Questionnaire (IMQ): factor structure, reliability, and validity

Scale Item no. Item n Difficulty index Variance Discrimination index Factor loading Cronbach’s α
Attitude A1 Important - Unimportant 5234 87.7 0.64 .722 .908 .793
  A2 A good thing - A bad thing 5156 89.1 0.51 .758 .930  
  A3 Comfortable - Uncomfortable 5000 47.5 1.14 .374 .375  
  A4 Advantageous - Disadvantageous 5075 82.6 0.69 .678 .752  
Barriers: assumptions about MSP B1 Uncomfortable with body being touched during examination 5244 34.1 1.85 .301 .569 .525 (only items B1, B2, B3, B6)
  B2 Afraid of pain during MS 5253 35.9 2.09 .367 .666  
  B3 Got conflicting advice regarding MSP 5194 25.5 1.95 .349 .345  
  B4 See the course of disease as predetermined 5171 22.3 1.51 .229 -  
  B5 Don’t want to know whether something is wrong 5238 9.3 0.85 .255 -  
  B6 Insecure what to expect 5229 35.4 2.15 .288 .471  
  B7 Radiation of MS is harmful 5146 34.3 1.42 .299 -  
  B8 Feel obliged through the invitation 5237 74.6 2.15 -.210 -  
  B9 Have trust in the MSP 5235 31.1 1.79 .115 -  
Barriers: importance of MSP B10 Other problems more important than MS 5249 15.9 1.20 .326 .730 .583 (only items B10, B11)
  B11 No time for appointment 5219 7.4 0.65 .421 .517  
  B12 Am on holiday/abroad 5163 1.3 0.14 .205 -  
  B13 Have language problems 5188 1.3 0.15 .193 -  
  B14 Financial costs are too high 5097 5.8 0.56 .345 -  
  B15 Problems getting to the screening unit 5198 4.0 0.41 .332 -  
Norms N1 Gynecologist 2992 94.1 0.45 .539 .519 .795
  N2 General practitioner 1130 92.2 0.54 .560 .572  
  N3 Partner 2306 91.7 0.60 .590 .673  
  N4 Relatives 1965 83.7 1.03 .637 .732  
  N5 Friends/acquaintances 2812 81.3 1.12 .621 .610  
  1. Note. MSP: mammography screening programme. MS: mammography screening