Table 3 Equivalent summed item response theory score estimates for subjects without suicidal ideation at the baseline (NSI) and subjects with suicidal ideation at the baseline (SI)

108

33.4

-0.425

0

0

0

3

0.6

0.613

0

2

1

7

2.2

-0.392

0

0

-

1

0.2

0.626

2

0

-

1

0.3

-0.27

-

0

0

44

9.3

0.655

1

1

1

2

0.6

-0.173

1

0

1

8

1.7

0.707

2

0

1

15

4.6

-0.058

0

0

1

2

0.4

0.742

1

1

2

3

0.9

-0.036

0

0

2

1

0.2

0.746

1

1

3

6

1.9

0.114

0

1

0

2

0.4

0.775

1

2

0

55

17.0

0.163

1

0

0

1

0.2

0.809

2

0

2

6

1.9

0.196

1

0

-

46

9.7

0.845

2

1

0

2

0.6

0.259

1

-

0

2

0.4

0.849

2

-

0

7

2.2

0.288

0

1

1

2

0.4

0.885

-

-

1

18

5.6

0.331

1

0

1

7

1.5

0.943

1

2

1

1

0.3

0.353

1

-

-

5

1.1

0.962

2

1

-

84

26.0

0.494

1

1

0

79

16.7

0.999

2

1

1

2

0.6

0.539

2

0

0

1

0.2

1.076

2

-

1

6

1.9

0.569

1

1

-

3

0.6

1.14

2

1

2

2

0.4

1.153

2

1

3

9

1.9

1.172

2

2

0

3

0.6

1.206

3

1

0

63

13.3

1.317

2

2

1

5

1.1

1.318

2

2

-

7

1.5

1.356

3

1

1

7

1.5

1.444

2

2

2

4

0.9

1.467

2

2

3

2

0.4

1.483

3

1

2

1

0.2

1.492

4

1

1

4

0.9

1.501

3

2

0

5

1.1

1.548

2

3

1

1

0.2

1.572

2

4

1

50

10.6

1.602

3

2

1

4

0.9

1.627

3

2

-

12

2.5

1.713

3

2

2

2

0.4

1.751

3

2

3

1

0.2

1.774

2

3

3

9

1.9

1.827

3

3

1

17

3.6

1.841

4

2

1

1

0.2

1.893

4

2

-

2

0.4

1.928

3

3

2

8

1.7

1.95

4

2

2

2

0.4

1.983

3

3

3

1

0.2

2.01

4

2

3

11

2.3

2.079

4

3

1

1

0.2

2.172

4

3

-

13

2.8

2.199

4

3

2

2

0.4

2.324

4

3

3

1

0.2

2.325

4

4

0

1

0.2

2.387

4

4

1

2

0.4

2.453

5

3

1

1

0.2

2.515

4

4

2

1

0.2

2.553

5

3

2

4

0.9

2.677

5

3

3

1

0.2

2.911

6

3

-

2

0.4

2.954

6

3

3

1

0.2

3.086

6

4

2

1

0.2

3.106

-

4

-

2

0.4

3.241

6

4

3