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Table 2 Screening results of the second item-selection phase using CTT and IRT

From: GC-PROM: validation of a patient-reported outcomes measure for Chinese patients with gastric cancer

ItemIRTSDFactor analysisCITCRetest reliabilityCorrelation coefficientPOutcome
αb1b2b3b4
PHD13.23−1.67−0.590.241.251.1410.3420.5870.9230.7020.001
PHD23.51−1.78−0.700.070.981.1790.3510.6010.8870.7160.001
PHD30.80−3.63−1.480.713.081.0600.7490.4540.8820.5850.001×
PHD40.96−3.94−2.47−0.781.141.0630.0820.4630.9150.5930.001×
PHD51.33−3.53−2.92−1.71−0.190.9230.1910.5250.7910.6290.001×
PHD61.13−2.99−1.250.022.211.0660.6840.5770.8390.6870.001
PHD70.83−2.81−1.320.332.671.1810.6100.4890.9270.6280.001
PHD81.19−3.62−2.49−1.060.771.0010.5710.5880.8820.6900.001
PHD90.42−7.06−4.04− 0.503.281.0930.4430.3250.9280.4790.001×
PHD103.25−3.10−2.39−1.35−0.090.7580.7140.5990.8180.8170.001
PHD112.00−2.72−2.01−1.150.390.9370.5710.5000.7950.8140.001
PHD121.29−4.66−3.32−1.85−0.050.7980.4670.4190.8050.7250.001×
PHD131.26−2.28−1.060.572.091.1030.5110.4960.7270.7690.001
PHD149.30−1.60−0.600.381.391.0190.4370.7720.8460.9010.001
PHD153.46−1.69−0.810.101.221.1020.3300.7000.8260.8760.001
PHD165.25−0.92−0.140.791.731.1290.8140.7990.9050.9460.001
PHD174.32−1.58−0.500.311.111.1760.7800.7990.9550.9510.001
PSD13.32−1.49−0.370.531.481.1240.8300.6910.8090.8750.001
PSD23.77−1.02−0.110.781.491.1950.8690.7130.8440.8940.003
PSD31.18−4.14−1.94−0.441.660.9460.4560.4650.8660.7150.001×
PSD42.41−2.48−1.49−0.320.641.0310.7880.6830.8660.8050.001
PSD53.33−1.87−1.04−0.110.851.0910.7990.7570.9140.8580.002
PSD63.41−1.79− 1.07−0.190.861.1010.7570.7440.9210.8510.001
PSD72.88−2.68−1.47−0.570.810.9170.7540.7180.8650.8170.005×
PSD81.21−3.09−1.68−0.141.811.0220.5440.4850.8860.6630.001
PSD92.90−2.30− 1.33−0.380.501.0850.8320.7550.8340.8870.001
PSD103.52−1.84−0.860.010.931.1490.8490.7810.8220.9060.001
PSD115.12−1.80−1.01−0.300.591.1450.8350.8140.7430.9210.001
SOD14.27−5.58−1.78−1.13−0.050.8270.8830.7400.8600.8680.006
SOD25.00−2.14−1.24−0.620.341.0440.9080.7610.9050.9050.001
SOD31.86−2.02−0.990.301.501.0790.8130.6220.8350.8440.001
SOD41.01−4.17−2.97−1.860.180.9480.5220.3990.8810.5750.001×
SOD51.41−2.30−0.970.391.801.1170.7170.5690.8380.7300.001
SOD66.85−1.53−0.680.141.131.1260.9260.8420.7370.9090.001
SOD75.99−1.66−0.720.211.071.1110.9180.8340.7110.9040.001
SOD82.52−1.59−0.890.081.151.1760.8130.6620.7640.8010.001
THD13.63−1.99−1.190.001.110.9830.8680.7800.8040.8980.001
THD27.16−1.76−0.780.241.121.0310.8630.8290.7760.9260.001
THD32.78−2.06−0.930.121.001.0980.7800.7460.6960.8930.001
THD42.043.18− 2.14−0.221.200.8540.6570.5440.8800.8850.001
THD52.85−2.81−1.620.211.500.8120.6010.5440.7360.8720.001
THD63.61−2.65−1.64−0.790.480.8880.8680.7800.8110.9080.001
THD713.24−4.71−2.08−0.760.240.7820.9360.8930.8260.9510.001
THD85.49−4.47−1.89−0.710.350.8260.8980.8330.9010.9260.006
THD92.76−2.14−1.320.211.290.9670.8600.5740.8500.8800.001
THD102.19−1.81−0.820.511.961.0270.8600.5740.9180.8940.001
  1. “√"was represented the selected item. “×” represented the item considered to be deleted. Bold word indicated values did not meet the criteria
  2. PHD physiological domain, PSD psychological domain, SOD social domains, THD therapeutic domain, IRT item response theory, SD standard deviation, CITC corrected item-total correlation