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Table 4 IRT Calibration Results of SR item bank

From: Development and calibration of a novel social relationship item bank to measure health-related quality of life (HRQoL) in Singapore

Item ID Mean Item-theta correlation Cronbach’s alpha if deleted IRT GRM item fit p-value
Discrimination B1 B2 B3 B4
SQ01 4.584 0.711 0.961 2.072 −2.43 −2.18 −1.75 0.55 1.000
SQ32 4.35 0.713 0.961 1.509 −2.74 − 2.25 − 1.39 −0.09 0.734
SQ39 4.531 0.673 0.962 1.378 −3.54 −3.18 − 2.06 − 0.30 0.193
SQ11 4.546 0.754 0.961 2.081 −2.58 − 2.29 −1.71 − 0.42 1.000
SQ02 4.175 0.672 0.962 1.179 −2.63 −1.97 − 1.13 0.06 0.711
SQ33 4.286 0.71 0.961 1.266 −2.94 − 2.40 −1.33 0.07 0.714
SQ10 4.493 0.629 0.962 1.191 −2.76 − 2.29 −1.81 − 0.46 0.086
SQ40 4.483 0.713 0.961 1.418 −4.16 −3.00 −1.74 −0.23 0.997
SQ12 4.553 0.702 0.961 1.608 −2.77 −2.30 −1.65 −0.53 0.981
SQ07 4.171 0.641 0.962 1.021 −2.89 − 2.09 −1.17 0.12 0.446
SQ16 4.125 0.627 0.962 0.963 −3.5 −2.36 −1.08 0.29 0.226
SQ34 3.917 0.607 0.962 0.95 −2.33 −1.68 −0.79 0.29 0.000
SQ41 4.235 0.692 0.961 1.23 −3.16 −2.24 −1.13 0.04 0.030
SQ04 4.545 0.692 0.961 1.54 −2.64 − 2.28 −1.65 −0.53 0.888
SQ08 4.453 0.711 0.961 1.435 −2.78 −2.29 −1.55 −0.30 0.997
SQ17 4.376 0.66 0.962 1.153 −3.77 −2.88 −1.50 −0.11 0.613
SQ43 4.326 0.607 0.962 1.007 −3.95 −2.74 −1.47 −0.08 0.229
SQ45 4.517 0.72 0.961 1.634 −2.83 −2.41 −1.63 −0.38 0.828
SQ31 4.266 0.675 0.961 1.229 −2.73 −2.32 −1.32 0.02 0.630
SQ35 4.26 0.642 0.961 1.044 −3.42 −2.57 −1.29 0.06 0.402
SQ44 4.292 0.734 0.961 1.464 −3.24 −1.97 − 1.22 −0.04 0.060
SQ05 4.503 0.674 0.961 1.445 −2.5 −2.36 −1.58 −0.48 0.546
SQ18 3.817 0.6 0.962 0.863 −2.96 −1.75 −0.62 0.64 0.073
SQ15 4.024 0.586 0.962 0.896 −3.01 −2.56 −1.04 0.54 0.191
SQ37 4.475 0.66 0.962 1.221 −4.35 −3.36 −1.89 −0.18 0.949
SQ06 4.345 0.673 0.961 1.256 −2.56 −2.19 −1.41 −0.18 0.999
SQ20 3.787 0.575 0.962 0.794 −3.48 −1.97 −0.51 0.80 0.005
SQ48 4.167 0.663 0.962 1.138 −2.75 −2.11 −1.14 0.13 0.078
SQ50 2.765 0.074 0.969 0.157 −3.95 −0.11 2.26 5.29 0.000
SQ51 3.974 0.656 0.962 1.05 −2.73 −2.20 −1.01 0.73 0.321
  1. Abbreviations: Social relationships (SR), item response theory (IRT), graded response model (GRM)