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Table 4 Approximate relative item information and estimated discrimination based on the 2PL GRM model

From: An item response theory evaluation of three depression assessment instruments in a clinical sample

Item Rel. info % Discr. S.E(Discr.)
AS-18-D1 <5 0.574 0.188
AS-18-D2 30 2.845 0.723
AS-18-D3 5 0.923 0.220
AS-18-D4 10 1.256 0.908
AS-18-D5 15 1.751 0.274
AS-18-D6 5 0.861 0.189
AS-18-D7 10 1.313 0.331
AS-18-D8 10 1.102 0.253
AS-18-D9 15 1.710 0.416
PHQ9:1 >25 2.425 0.390
PHQ9:2 10 1.266 0.593
PHQ9:3 5 0.918 0.183
PHQ9:4 10 1.209 0.216
PHQ9:5 5 0.704 0.209
PHQ9:6 15 1.484 0.426
PHQ9:7 10 1.245 0.269
PHQ9:8 5 0.891 0.173
PHQ9:9 10 1.150 0.278
MADRS1 25 1.927 0.719
MADRS2 15 1.425 0.481
MADRS3 15 1.175 0.239
MADRS4 <<5 0.273 0.047
MADRS5 5 0.712 0.209
MADRS6 5 0.659 0.180
MADRS7 5 0.783 0.134
MADRS8 10 1.065 0.155
MADRS9 10 0.898 0.259
MADRS10 5 0.683 0.233