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Table 5 Results of the second item-selection phase using CTT and IRT

From: Development and validation of a patient-reported outcome measure for stroke patients

Item SD Factor loading Correlation coefficient CITC CAID IRT Outcome
α b 1 b 2 b 3 b 4
PHD1 1.526 0.745 0.685 0.527 0.777 0.54 −2.65 −1.22 −0.31 1.40
PHD2 1.467 0.805 0.638 0.473 0.786 0.68 −2.59 −1.11 −0.36 1.06
PHD3 1.543 0.643 0.658 0.488 0.785 0.88 −0.94 −0.06 0.71 1.80
PHD4 1.350 0.659 0.687 0.551 0.771 1.14 −2.08 −1.18 −0.62 0.22
PHD5 1.230 0.828 0.726 0.616 0.762 1.30 −2.33 −1.37 −0.73 −0.19
PHD6 1.218 0.818 0.671 0.547 0.773 1.00 −2.79 −1.61 −0.72 0.58
PHD7 1.293 0.628 0.686 0.557 0.771 1.02 −2.51 −1.45 −0.46 0.44
PHD8 1.282 0.784 0.805 0.637 0.710 1.14 −2.23 −1.17 −0.31 0.77
PHD9 1.314 0.737 0.812 0.642 0.706 1.27 −1.84 −0.87 −0.12 0.92
PHD10 1.230 0.666 0.777 0.602 0.728 1.58 −1.94 −1.06 −0.45 0.33
PHD11 1.491 0.560 0.733 0.470 0.677 1.38 −1.33 −0.65 −0.23 0.47
PHD12 1.349 0.673 0.759 0.546 0.627 1.53 −1.61 −0.91 −0.33 0.33
PHD13 1.390 0.515 0.732 0.497 0.783 1.05 −1.84 −0.68 0.00 1.25
PHD14 1.305 0.807 0.711 0.481 0.666 0.77 −3.04 −1.74 −0.80 0.83
PHD15 1.329 0.772 0.739 0.519 0.643 0.93 −2.19 −1.68 −0.98 0.43
PHD16 1.553 0.766 0.833 0.744 0.931 1.23 −1.12 −0.63 −0.19 0.66
PHD17 1.546 0.865 0.893 0.833 0.915 1.11 −1.17 −0.64 −0.03 0.87
PHD18 1.679 0.836 0.873 0.794 0.922 1.29 −0.46 0.04 0.40 1.03
PHD19 1.663 0.888 0.913 0.857 0.910 1.27 −0.59 −0.13 0.23 0.97
PHD20 1.606 0.896 0.925 0.879 0.906 1.35 −0.77 −0.26 0.13 0.93
PSD1 1.461 0.719 0.763 0.597 0.809 0.88 −1.53 −0.37 0.20 1.86
PSD2 1.303 0.714 0.754 0.606 0.805 1.12 −2.21 −0.67 −0.03 1.36
PSD3 1.271 0.763 0.780 0.649 0.793 1.38 −1.93 −0.85 −0.26 0.99
PSD4 1.338 0.703 0.768 0.622 0.800 1.25 −1.54 −0.37 0.21 1.74
PSD5 1.296 0.756 0.806 0.684 0.783 1.50 −1.67 −0.59 −0.01 1.18
PSD6 1.232 0.635 0.709 0.546 0.849 1.78 −1.74 −0.84 −0.28 0.72
PSD7 1.225 0.507 0.786 0.656 0.821 1.65 −1.83 −0.91 −0.34 0.79
PSD8 1.260 0.669 0.843 0.738 0.799 1.88 −1.62 −0.81 −0.24 0.74
PSD9 1.302 0.742 0.806 0.676 0.816 1.93 −1.53 −0.53 −0.19 0.78
PSD10 1.236 0.767 0.811 0.693 0.811 2.18 −1.66 −0.75 −0.37 0.48
PSD11 1.229 0.556 0.808 0.649 0.730 2.07 −1.72 −0.81 −0.27 0.59
PSD12 1.264 0.626 0.847 0.709 0.698 2.12 −1.55 −0.73 −0.20 0.62
PSD13 1.352 0.647 0.758 0.544 0.783 1.28 −1.93 −0.88 −0.26 0.64
PSD14 1.256 0.430 0.748 0.550 0.777 1.76 −1.62 −0.87 −0.39 0.71
SOD1 1.486 0.797 0.885 0.745 0.914 1.28 −1.41 −0.19 −0.26 1.05
SOD2 1.464 0.878 0.943 0.868 0.811 1.55 −1.20 −0.25 0.25 0.96
SOD3 1.511 0.825 0.920 0.814 0.857 1.63 −1.13 −0.20 0.19 0.76
SOD4 1.560 0.744 0.848 0.688 0.784 0.22 −5.34 −3.21 −2.21 2.39
SOD5 1.233 0.833 0.813 0.680 0.788 0.39 −6.31 −3.12 −2.02 1.70
SOD6 1.510 0.790 0.852 0.704 0.774 0.28 −4.74 −2.26 −1.35 2.60
SOD7 1.189 0.766 0.766 0.616 0.814 0.44 −5.74 −3.72 −2.61 1.12
THD1 1.026 0.817 0.820 0.736 0.825 0.54 −6.29 −4.54 −1.95 0.33
THD 2 1.140 0.743 0.798 0.692 0.831 0.47 −6.03 −3.89 −2.11 0.73
THD 3 1.252 0.666 0.711 0.549 0.861 0.33 −6.00 −2.44 1.08 4.05 X
THD 4 1.080 0.750 0.736 0.614 0.845 0.50 −6.89 −4.28 −1.91 0.59
THD 5 1.022 0.773 0.775 0.674 0.835 0.54 −6.19 −4.46 −2.26 0.28
THD 6 1.151 0.783 0.796 0.687 0.831 0.59 −5.00 −3.19 −1.31 0.79
  1. Note: CTT, classical test theory; IRT, item response theory; SD, Standard Deviation; CITC, corrected item-total correlation; CAID, Cronbach’s α if item deleted ;"√" decision to retain the selected item, "X" to delete the item; boldface indicates values that did not meet standard.