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Table 6 Item characteristics of the IPS in subgroups of patients and staff

From: Development and psychometric properties of a scale for measuring internal participation from a patient and health care professional perspective

Subgroup N Discrimination (corrected item-total correlation) range Difficulty (mean; range 1–4) Internal consistency (Cronbach’s alpha)
Patients
Indication group
   - Somatic 345 .556-.770 3.43-3.72 .878
   - Psychosomatic 191 .473-.763 3.21-3.47 .853
Gender
   - Male 334 .549-.785 3.40-3.58 .875
   - Female 198 .537-.787 3.40-3.71 .882
Education
   - Low 233 .536-.799 3.51-3.67 .864
   - Medium 177 .556-.802 3.32-3.60 .898
   - High 106 .558-.721 3.29-3.58 .846
Age groups
   - 18-40 97 .414-.757 3.31-3.51 .855
   - 41-60 276 .540-.772 3.35-3.59 .865
   - >60 151 .515-.775 3.67-3.83 .867
Staff
Indication group
   - Somatic 198 .506-.736 2.92-3.31 .872
   - Psychosomatic 52 .510-.713 2.56-2.96 .834
Gender
   - Male 94 .644-.791 2.82-3.12 .898
   - Female 164 .670-.741 2.83-3.27 .856
Professionals
   - Physicians 49 .741-.781 3.00-3.47 .916
   - Nursing staff 48 .294-.758 2.63-3.08 .871
   - Psychosocial therapists 67 .356-.567 2.73-3.98 .746
   - Physical therapists 50 .444-.816 2.88-3.41 .867
   - Other professionals 37 .507-.715 2.74-3.32 .824
Age groups
   - 17 – 35 52 .480-.732 2.76-3.46 .806
   - 36 - 55 170 .504-.775 2.84-3.15 .883
   - 56 and older 38 .675-.868 2.88-3.24 .906