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Table 6 P_irt item parameters

From: Measuring the ICF components of impairment, activity limitation and participation restriction: an item analysis using classical test theory and item response theory

  Item parameters
P_irt item Discrim Difficulty: location parameters
  a b1
(se)
b2
(se)
b3
(se)
b4
(se)
P1. How does your joint problem restrict your opportunities for leisure activities? 1.39 -3.40
(0.41)
-2.19
(0.24)
-0.90
(0.13)
1.05
(0.16)
P2. How does your joint problem restrict you doing your hobbies? 1.09 -2.54
(0.32)
-1.54
(0.21)
-0.30
(0.13)
1.58
(0.24)
P3. How does your joint problem restrict you doing your usual social activities? 1.93 -2.16
(0.18)
-0.89
(0.10)
0.13
(0.09)
1.57
(0.16)
P4. How does your joint problem restrict you visiting friends or relatives? 2.84 -0.90
(0.08)
-0.03
(0.07)
0.67
(0.08)
1.80
(0.13)
P5. How much of the time has your physical health or emotional problems interfered with your social activities (like visiting with friends, relatives, etc.)? 2.16 -0.76
(0.09)
-0.11
(0.08)
0.79
(0.09)
1.72
(0.15)
P6. How much do you enjoy life? 1.16 -2.69
(0.36)
0.53
(0.14)
2.62
(0.35)
4.44
(0.76)
P7. How healthy is your physical environment? 0.87 -2.17
(0.35)
0.49
(0.18)
3.31
(0.56)
5.62
(1.14)
P8. How available to you is the information that you need in your day-to-day life? 1.11 -1.25
(0.19)
1.06
(0.19)
2.81
(0.39)
4.86
(0.91)
P9. How satisfied are you with your personal relationship? 0.97 -1.10
(0.20)
1.12
(0.21)
2.45
(0.37)
4.27
(0.74)
P10. How does your joint problem restrict you having friends or relatives over to your home? 1.94 -0.22
(0.08)
0.63
(0.10)
1.67
(0.16)
2.56
(0.28)
P11. How satisfied are you with your transport? 0.91 -1.19
(0.23)
1.87
(0.33)
3.75
(0.65)
5.40
(1.12)
P12. How does your joint problem restrict you getting on with people (friends and family)? 1.78 -0.19
(0.09)
0.66
(0.11)
1.95
(0.21)
3.05
(0.39)
P13. How satisfied are you with your access to health services? 0.68 -1.35
(0.32)
3.02
(0.67)
5.14
(1.16)
9.08
(2.74)
P14. How satisfied are you with the support you get from your friends? 0.69 -1.08
(0.28)
2.98
(0.62)
6.35
(1.46)
7.36
(1.91)
P16. How does your joint problem restrict you affording things you need? 1.26 0.61
(0.14)
1.35
(0.20)
2.11
(0.30)
2.99
(0.45)
P17. How does your joint problem restrict you showing affection? 1.42 0.50
(0.12)
1.34
(0.18)
2.38
(0.31)
3.49
(0.54)
P18. How satisfied are you with the conditions of your living place? 0.97 -0.01
(0.15)
2.91
(0.49)
4.52
(0.87)
6.55
(1.68)
P19. How does your joint problem restrict you telephoning friends or relatives? 2.27 1.08
(0.12)
1.80
(0.21)
2.97
(1.12)
4.77
(-)
TOTAL      
  1. Key: Items in bold = items with low discrimination parameter (< 1.25), (-) = not calculated