Table 3 The item quality of GDS in four dimensions

Dimension 1: Agitation

GDS6

-0.072

1.05

1.07

0.669

GDS8

-0.172

0.95

0.87

0.570

GDS13

-0.021

0.94

0.85

0.569

GDS18

0.730

0.92

0.78

0.584

GDS29

-0.464

1.19

1.31

0.684

Dimension 2: Cognitive concerns

GDS14

-0.468

1.11

1.18

0.490

GDS26

-0.004

1.01

0.95

0.538

GDS30

0.472

0.96

0.94

0.387

Dimension 3: Dysphoria

GDS1

0.671

0.88

0.72

0.824

GDS2

-1.463

1.22

1.48

0.843

GDS3

-0.491

0.93

0.93

0.824

GDS4

-0.374

0.82

0.66

0.815

GDS10

0.031

0.93

0.82

0.826

GDS11

0.583

0.92

0.92

0.825

GDS16

-0.139

0.84

0.71

0.819

GDS23

-0.503

1.46

2.01

0.855

GDS24

0.511

0.97

0.78

0.829

GDS25

1.173

0.96

0.85

0.831

Dimension 4: Vigor/withdrawal

GDS5

-0.932

1.00

0.96

0.764

GDS12

0.054

1.27

1.35

0.786

GDS15

0.306

1.02

1.13

0.771

GDS17

0.948

0.88

0.67

0.760

GDS19

-1.034

0.93

0.91

0.754

GDS20

-1.828

1.09

1.23

0.779

GDS21

-0.735

0.84

0.73

0.743

GDS22

1.405

0.83

0.56

0.761

GDS27

0.823

1.01

1.01

0.772

GDS28

0.994

1.19

1.32

0.779