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Table 2 IRT parameter estimates for the LEIDS-RR-CV for perinatal women

From: Supporting routine cognitive reactivity assessment during the perinatal period: psychometric testing of the Chinese version of the Leiden Index of Depression Sensitivity

Item

The third trimester women

The 6-week postpartum women

Slopeα(SE)

Difficulty

Maximum value of TIF

Mean value of TIFa

Slopeα(SE)

Difficulty

Maximum value of TIF

Mean value of TIFa

β1 (SE)

β2 (SE)

β3 (SE)

β4 (SE)

β1 (SE)

β2 (SE)

β3 (SE)

β4 (SE)

I1

1.12

(0.14)

-1.01

(0.16)

1.43

(0.19)

3.40

(0.45)

4.44

(0.66)

0.38

0.29

2.06

(0.18)

-1.22

(0.12)

0.06

(0.09)

1.08

(0.11)

2.32

(0.21)

1.22

0.77

I8

1.27

(0.16)

-0.48

(0.12)

1.27

(0.17)

3.24

(0.41)

/

0.46

0.33

2.45

(0.21)

-0.95

(0.10)

0.13

(0.09)

1.11

(0.10)

2.29

(0.20)

1.70

0.96

I11

1.65

(0.19)

0.01

(0.10)

1.44

(0.15)

2.58

(0.28)

3.82

(0.55)

0.81

0.49

2.44

(0.21)

-0.79

(0.09)

0.14

(0.09)

1.19

(0.11)

2.30

(0.20)

1.70

0.93

I24

1.46

(0.19)

0.64

(0.11)

1.92

(0.22)

3.09

(0.38)

4.17

(0.65)

0.65

0.36

2.67

(0.24)

-0.42

(0.08)

0.20

(0.09)

1.33

(0.11)

2.39

(0.22)

2.11

1.00

I25

1.03

(0.13)

-1.23

(0.19)

0.73

(0.15)

2.28

(0.29)

4.17

(0.60)

0.32

0.26

1.93

(0.18)

-1.04

(0.12)

-0.17

(0.09)

1.06

(0.11)

2.31

(0.21)

1.11

0.68

I4

1.85

(0.23)

0.51

(0.09)

1.92

(0.22)

3.91

(0.65)

/

0.93

0.49

2.90

(0.26)

-0.65

(0.08)

0.22

(0.09)

1.30

(0.10)

2.46

(0.23)

2.33

1.19

I13

1.93

(0.26)

1.00

(0.12)

2.10

(0.22)

3.45

(0.49)

/

1.07

0.50

3.06

(0.27)

-0.48

(0.08)

0.30

(0.09)

1.38

(0.11)

2.50

(0.24)

2.61

1.26

I16

2.29

(0.25)

0.20

(0.08)

1.50

(0.14)

2.39

(0.23)

/

1.52

0.67

2.89

(0.26)

-0.62

(0.08)

0.22

(0.09)

1.42

(0.11)

2.38

(0.21)

2.31

1.17

I17

2.02

(0.23)

0.09

(0.09)

1.44

(0.14)

2.41

(0.24)

3.32

(0.44)

1.22

0.67

2.51

(0.22)

-0.79

(0.09)

0.24

(0.09)

1.32

(0.11)

2.91

(0.34)

1.75

1.02

I20

2.24

(0.27)

0.63

(0.09)

1.94

(0.18)

2.98

(0.35)

/

1.41

0.65

2.99

(0.27)

-0.56

(0.08)

0.23

(0.08)

1.42

(0.11)

2.43

(0.22)

2.49

1.22

I3

2.34

(0.25)

0.02

(0.08)

1.30

(0.12)

2.33

(0.21)

3.12

(0.38)

1.61

0.84

3.94

(0.37)

-0.71

(0.08)

0.17

(0.08)

1.27

(0.09)

2.05

(0.16)

4.10

1.73

I5

2.89

(0.39)

1.00

(0.10)

1.78

(0.16)

/

/

2.33

0.59

3.65

(0.33)

-0.51

(0.08)

0.34

(0.08)

1.37

(0.10)

2.18

(0.18)

3.57

1.56

I12

2.44

(0.26)

0.08

(0.08)

1.17

(0.11)

2.11

(0.19)

3.03

(0.36)

1.71

0.89

3.64

(0.33)

-0.68

(0.08)

0.27

(0.08)

1.31

(0.10)

2.10

(0.17)

3.56

1.57

I23

2.55

(0.32)

0.90

(0.10)

1.65

(0.15)

2.71

(0.28)

/

1.90

0.72

4.71

(0.47)

-0.08

(0.07)

0.42

(0.08)

1.59

(0.11)

2.16

(0.18)

6.13

1.98

I26

2.98

(0.40)

1.01

(0.10)

1.86

(0.16)

2.83

(0.32)

/

2.47

0.90

4.76

(0.49)

0.01

(0.07)

0.41

(0.08)

1.58

(0.11)

2.16

(0.18)

6.52

1.94

I2

0.94

(0.13)

-0.74

(0.17)

1.05

(0.18)

3.58

(0.51)

5.88

(1.06)

0.26

0.21

2.72

(0.23)

-0.99

(0.10)

0.05

(0.08)

1.02

(0.10)

2.10

(0.17)

2.05

1.10

I6

0.97

(0.13)

-1.26

(0.21)

1.02

(0.17)

3.81

(0.54)

5.71

(1.01)

0.27

0.23

2.94

(0.25)

-1.02

(0.10)

0.06

(0.08)

0.95

(0.09)

2.13

(0.17)

2.38

1.23

I14

0.89

(0.12)

-1.44

(0.23)

0.51

(0.15)

2.64

(0.37)

4.70

(0.73)

0.24

0.21

2.28

(0.20)

-1.08

(0.11)

0.01

(0.09)

0.93

(0.10)

2.31

(0.20)

1.51

0.88

I22

1.00

(0.14)

-0.78

(0.16)

1.16

(0.19)

4.39

(0.67)

6.22

(1.26)

0.29

0.22

2.77

(0.24)

-0.76

(0.09)

0.05

(0.08)

1.12

(0.10)

2.24

(0.19)

2.16

1.10

I7

1.77

(0.18)

-0.56

(0.11)

0.80

(0.11)

2.34

(0.23)

3.21

(0.38)

0.94

0.59

3.04

(0.26)

-0.98

(0.09)

0.04

(0.08)

0.92

(0.09)

2.33

(0.20)

2.54

1.29

I9

2.55

(0.26)

-0.25

(0.08)

1.14

(0.11)

2.10

(0.18)

2.99

(0.35)

1.86

0.98

3.08

(0.27)

-0.89

(0.09)

0.11

(0.08)

1.18

(0.10)

2.52

(0.24)

2.54

1.33

I10

2.25

(0.24)

-0.10

(0.08)

1.19

(0.12)

2.25

(0.21)

3.46

(0.52)

1.43

0.82

3.31

(0.29)

-0.76

(0.08)

0.21

(0.08)

1.14

(0.09)

2.34

(0.21)

2.94

1.43

I15

2.14

(0.22)

-0.46

(0.09)

1.05

(0.11)

2.35

(0.22)

3.56

(0.54)

1.27

0.79

3.75

(0.33)

-0.74

(0.08)

0.16

(0.08)

1.10

(0.09)

2.17

(0.17)

3.73

1.66

I18

2.11

(0.22)

-0.20

(0.09)

1.21

(0.12)

2.17

(0.20)

3.06

(0.36)

1.32

0.74

3.57

(0.32)

-0.74

(0.08)

0.18

(0.08)

1.14

(0.09)

2.49

(0.25)

3.39

1.59

I19

1.91

(0.20)

-0.70

(0.11)

1.06(0.12)

2.51

(0.25)

/

0.99

0.60

3.66

(0.33)

-0.81

(0.08)

0.14

(0.08)

1.14

(0.09)

2.34

(0.21)

3.52

1.64

I21

2.07

(0.20)

-0.88

(0.11)

0.69

(0.10)

1.96

(0.18)

2.78

(0.30)

1.27

0.76

3.57

(0.31)

-0.86

(0.09)

0.09

(0.08)

1.07

(0.09)

2.05

(0.16)

3.38

1.56

  1. "/"indicates that only four options are selected and the other option is not selected
  2. TIF Test information function
  3. aMean test information function of seven categories, that is, categories − 3, − 2, − 1, 0, 1, 2, 3