Skip to main content

Table 4 Results of the first 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 1.464 0.752 0.784 0.705 0.908 0.88 −1.67 −0.37 0.09 1.72
PHD2 1.423 0.706 0.763 0.712 0.906 1.13 −1.85 −0.39 −0.12 1.16
PHD3 1.446 0.799 0.811 0.77 0.900 1.30 −1.44 −0.78 −0.32 0.36
PHD4 1.355 0.734 0.822 0.739 0.903 1.26 −1.16 −0.10 0.61 1.97
PHD5 1.320 0.845 0.799 0.825 0.894 1.59 −1.78 −0.71 −0.34 0.25
PHD6 1.246 0.811 0.758 0.768 0.901 1.29 −2.20 −0.93 −0.22 0.77
PHD7 1.213 0.722 0.743 0.689 0.908 1.57 −1.90 −0.72 0.03 0.98
PHD8 1.439 0.781 0.835 0.628 0.869 0.53 −3.23 −1.31 −0.32 1.77 X
PHD9 1.325 0.777 0.818 0.697 0.836 1.18 −1.98 −0.70 −0.10 1.05
PHD10 1.266 0.801 0.802 0.777 0.804 1.29 −1.71 −0.97 −0.49 0.95
PHD11 1.214 0.745 0.813 0.779 0.806 1.63 −1.89 −0.89 −0.37 0.49
PHD12 1.395 0.473 0.657 0.515 0.694 1.37 −1.62 −0.58 −0.38 0.50
PHD13 1.310 0.514 0.664 0.584 0.659 1.15 −1.89 −1.11 −0.53 0.61
PHD14 1.520 0.489 0.793 0.478 0.718 0.29 −4.94 −2.28 −0.60 2.39
PHD15 1.471 0.549 0.748 0.573 0.661 0.30 −5.24 −4.20 −2.91 0.52
PHD16 1.582 0.786 0.739 0.634 0.789 0.47 −2.40 −1.77 −1.07 1.19
PHD17 1.500 0.779 0.740 0.676 0.782 0.37 −3.83 −2.92 −1.87 0.97
PHD18 0.930 0.081 0.405 0.208 0.843 0.90 −4.18 −2.86 −2.25 −1.15 X
PHD19 1.535 0.262 0.495 0.299 0.843 0.74 −2.40 −0.3 0.13 1.01 X
PHD20 1.756 0.709 0.789 0.643 0.787 0.87 −0.31 0.16 0.47 1.27
PHD21 1.654 0.815 0.786 0.736 0.769 0.70 −1.28 −0.76 −0.30 0.93
PHD22 1.566 0.865 0.785 0.753 0.767 0.72 −1.69 −1.01 −0.48 0.87
PSD1 1.387 0.718 0.769 0.66 0.828 1.00 −1.64 −0.29 0.24 0.94
PSD2 1.413 0.784 0.735 0.584 0.840 1.00 −1.41 −0.11 0.32 2.03
PSD3 1.370 0.641 0.761 0.626 0.833 1.43 −1.34 −0.16 0.15 1.49
PSD4 1.264 0.679 0.750 0.704 0.822 1.76 −1.60 −0.63 −0.26 0.85
PSD5 1.237 0.407 0.565 0.474 0.854 1.85 −1.35 −0.73 −0.35 0.87 X
PSD6 1.319 0.566 0.697 0.592 0.838 1.58 −1.38 −0.12 0.23 1.65
PSD7 1.230 0.595 0.706 0.696 0.824 1.80 −1.37 −0.63 −0.18 1.15
PSD8 1.317 0.652 0.511 0.439 0.902 0.99 −2.09 −1.10 −0.60 1.06 X
PSD9 1.022 0.727 0.614 0.502 0.893 1.11 −3.83 −1.93 −1.30 −0.05 X
PSD10 1.183 0.648 0.692 0.695 0.876 1.71 −1.83 −0.85 −0.60 0.65
PSD11 1.106 0.600 0.640 0.651 0.881 1.68 −2.15 −1.15 −0.62 0.70
PSD12 1.198 0.816 0.853 0.795 0.866 2.33 −1.51 −0.76 −0.19 0.83
PSD13 1.271 0.791 0.778 0.755 0.870 2.90 −1.32 −0.30 0.05 0.87
PSD14 1.288 0.845 0.810 0.777 0.868 2.43 −1.57 −0.60 −0.18 0.48
PSD15 1.200 0.820 0.776 0.766 0.869 2.80 −1.45 −0.72 −0.17 0.58
PSD16 1.128 0.551 0.724 0.609 0.645 1.91 −2.35 −0.99 −0.35 0.50
PSD17 1.215 0.589 0.706 0.632 0.631 1.86 −1.71 −0.87 −0.44 0.62
PSD18 1.321 0.441 0.721 0.472 0.695 1.13 −2.43 −0.77 −0.30 0.85
PSD19 1.222 0.515 0.655 0.485 0.689 1.61 −1.60 −1.02 −0.59 0.60
PSD20 1.310 0.325 0.528 0.305 0.759 0.73 −3.44 −1.53 −1.08 0.63 X
SOD1 1.403 0.658 0.578 0.382 0.776 0.72 −1.68 −0.04 1.14 2.59 X
SOD2 1.495 0.221 0.594 0.327 0.797 0.86 −1.86 −0.71 0.10 1.06 X
SOD3 1.502 0.632 0.761 0.580 0.709 1.07 −1.58 −0.34 0.35 1.04
SOD4 1.384 0.728 0.869 0.751 0.649 1.56 −1.47 −0.36 0.16 0.97
SOD5 1.365 0.651 0.800 0.701 0.669 1.88 −1.55 −0.45 0.01 0.62
SOD6 1.608 0.835 0.867 0.614 0.694 0.20 −4.51 −3.13 −2.34 3.21
SOD7 1.205 0.695 0.705 0.573 0.718 0.37 −6.67 −3.95 −3.14 1.58
SOD8 1.589 0.765 0.849 0.612 0.694 0.27 −3.91 −2.27 −1.66 2.69
SOD9 1.114 0.619 0.610 0.526 0.742 0.50 −5.02 −4.03 −2.72 1.34
THD1 0.961 0.362 0.650 0.304 0.451 0.39 −8.45 −6.33 −4.91 −0.72 X
THD 2 1.348 0.512 0.772 0.413 0.232 0.38 −6.18 −3.55 −1.78 −0.47 X
THD3 1.438 0.500 0.743 0.277 0.501 0.38 −5.01 −0.74 0.64 2.52 X
THD 4 1.265 0.585 0.694 0.495 0.835 0.37 −6.29 −3.13 −1.75 2.30
THD 5 1.090 0.741 0.753 0.643 0.807 0.56 −5.18 −3.67 −1.61 1.13
THD 6 1.299 0.732 0.785 0.662 0.801 0.55 −4.09 −2.25 −0.90 1.30
THD 7 1.440 0.716 0.751 0.574 0.823 0.33 −4.23 −0.36 1.31 4.26
THD 8 1.111 0.833 0.804 0.728 0.792 0.45 −8.11 −3.77 −1.71 1.14
THD 9 1.242 0.748 0.745 0.619 0.810 0.62 −3.61 −2.49 −1.06 1.23
  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; PHD, physical domain; PSD, psychological domain; SOD, social domain; THD, therapeutic domain; "√" decision to retain the selected item, "X" to delete the item; boldface indicates values that did not meet standard.