Table 3 Item content, response frequencies, IRT item parameter estimates and fit statistics

BDI_1

Sadness (DM)

1.94 (0.33)

−0.01 (0.13)

1.53 (0.21)

2.40 (0.35)

BDI_2

Pessimism (FH)

1.48 (0.23)

−0.88 (0.19)

0.15 (0.14)

1.47 (0.25)

BDI_3

Past failure (FH)

1.59 (0.26)

−0.54 (0.17)

0.33 (0.14)

1.71 (0.27)

BDI_4

Loss of pleasure (LI)

2.20 (0.32)

−0.59 (0.13)

0.80 (0.13)

1.79 (0.22)

BDI_5

Guilty feelings (FH)

1.31 (0.25)

−0.57 (0.2)

0.97 (0.21)

2.40 (0.43)

BDI_6

Punishment feelings (FH)

1.42 (0.27)

−0.40 (0.17)

0.56 (0.18)

0.89 (0.21)

BDI_7

Self-dislike (FH)

1.73 (0.27)

−0.36 (0.15)

0.67 (0.14)

1.67 (0.26)

BDI_8

Self-criticalness (FH)

1.27 (0.23)

−0.79 (0.21)

0.46 (0.19)

1.82 (0.33)

BDI_9

Suicidal thoughts (SU)

1.74 (0.29)

−0.16 (0.13)

1.41 (0.21)

2.02 (0.29)

BDI_10

Crying (DM)

1.12 (0.21)

−0.37 (0.22)

0.72 (0.22)

1.31 (0.30)

BDI_11

Agitation (PA)

1.36 (0.25)

−0.22 (0.19)

0.88 (0.21)

1.85 (0.37)

BDI_12

Loss of interest (LI)

1.88 (0.25)

−0.78 (0.14)

0.55 (0.15)

1.49 (0.21)

BDI_13

Indecisiveness (CD)

1.58 (0.25)

−0.75 (0.18)

0.76 (0.17)

2.39 (0.41)

BDI_14

Worthlessness (FH)

2.17 (0.30)

−0.37 (0.12)

0.62 (0.13)

1.33 (0.19)

BDI_15

Loss of energy (LE)

1.58 (0.22)

−1.62 (0.25)

0.24 (0.15)

1.77 (0.26)

BDI_16

Changes in sleep (CS)

0.84 (0.18)

−2.46 (0.56)

0.27 (0.26)

1.80 (0.43)

BDI_17

Irritability (DM)

1.27 (0.22)

−0.52 (0.18)

1.19 (0.25)

2.68 (0.49)

BDI_18

Changes in appetite (WC)

1.01 (0.21)

−0.41 (0.21)

1.39 (0.34)

2.99 (0.66)

BDI_19

Concentration difficulty (CD)

1.45 (0.26)

−0.84 (0.19)

0.54 (0.18)

2.20 (0.37)

BDI_20

Tiredness or fatigue (LE)

1.50 (0.24)

−1.51 (0.25)

0.66 (0.18)

2.26 (0.36)

BDI_21

Loss of interest in sex (LI)

1.17 (0.20)

−1.02 (0.24)

0.11 (0.2)

1.16 (0.25)

CESD_1

Bothered by things (CD)

1.54 (0.26)

−1.03 (0.20)

1.00 (0.19)

2.16 (0.36)

CESD_2

My appetite was poor (WC)

1.28 (0.26)

0.10 (0.17)

1.91 (0.37)

2.84 (0.58)

CESD_3

Couldn’t shake off blues (DM)

2.08 (0.26)

−0.86 (0.14)

0.37 (0.12)

1.22 (0.16)

CESD_4

I am just as good as other people (FH)

0.36 (0.17)

−7.85 (3.14)

−4.98 (2.09)

0.38 (0.61)

CESD_5

I had trouble concentrating (CD)

1.19 (0.21)

−1.18 (0.25)

0.82 (0.21)

2.61 (0.48)

CESD_6

I felt depressed (DM)

2.89 (0.41)

−1.03 (0.13)

0.31 (0.09)

1.20 (0.14)

CESD_7

Everything I did was an effort (LE)

1.92 (0.27)

−1.00 (0.17)

0.55 (0.13)

1.64 (0.23)

CESD_8

I felt good about the future (FH)

0.77 (0.17)

−4.18 (1.02)

−2.45 (0.55)

0.03 (0.27)

CESD_9

I thought I was a failure (FH)

2.33 (0.33)

−0.72 (0.13)

0.40 (0.11)

1.30 (0.17)

CESD_10

I felt fearful (DM)

1.62 (0.27)

−0.81 (0.17)

0.67 (0.15)

1.67 (0.26)

CESD_11

My sleep was restless (CS)

1.35 (0.21)

−1.36 (0.24)

0.00 (0.17)

1.04 (0.23)

CESD_12

I was happy (DM)

1.02 (0.17)

−3.26 (0.63)

−1.61 (0.33)

0.84 (0.26)

CESD_13

I talked less than usual (PA)

1.61 (0.22)

−0.82 (0.18)

0.59 (0.15)

1.61 (0.25)

CESD_14

I felt lonely (DM)

1.93 (0.25)

−0.70 (0.14)

0.34 (0.13)

1.11 (0.17)

CESD_15

People were unfriendly (FH)

1.37 (0.25)

−0.42 (0.18)

1.52 (0.30)

3.01 (0.57)

CESD_16

I enjoyed life (LI)

1.35 (0.20)

−2.71 (0.44)

−1.55 (0.26)

0.06 (0.17)

CESD_17

I had crying spells (DM)

1.45 (0.27)

−0.04 (0.15)

1.55 (0.25)

2.46 (0.41)

CESD_18

I felt sad (DM)

2.96 (0.39)

−0.53 (0.09)

0.55 (0.10)

1.27 (0.14)

CESD_19

I felt that people disliked me (FH)

1.49 (0.29)

−0.51 (0.17)

1.12 (0.22)

2.52 (0.44)

CESD_20

I could not “get going.” (DM)

2.37 (0.33)

−1.09 (0.14)

0.31 (0.12)

1.24 (0.15)

PHQ_1

Little interest (LI)

2.94 (0.37)

−0.79 (0.11)

0.51 (0.10)

1.25 (0.14)

PHQ_2

Feeling down, depressed, or hopeless (DM)

3.43 (0.44)

−0.67 (0.09)

0.45 (0.09)

1.35 (0.13)

PHQ_3

Sleep disturbance (CS)

1.58 (0.22)

−1.56 (0.22)

−0.01 (0.16)

0.68 (0.17)

PHQ_4

Feeling tired or having little energy (LE)

1.73 (0.26)

−1.43 (0.20)

−0.01 (0.13)

1.02 (0.18)

PHQ_5

Poor appetite or overeating (WC)

1.40 (0.24)

−0.26 (0.16)

0.94 (0.20)

1.75 (0.31)

PHQ_6

Feeling bad about oneself (FH)

2.41 (0.31)

−0.57 (0.11)

0.35 (0.11)

1.23 (0.16)

PHQ_7

Trouble concentrating (CD)

1.63 (0.23)

−0.52 (0.16)

0.75 (0.16)

1.64 (0.25)

PHQ_8

Moving or speaking slowly (PA)

1.67 (0.28)

−0.13 (0.14)

1.01 (0.19)

1.96 (0.29)

PHQ_9

Thoughts of death (SU)

2.76 (0.46)

0.44 (0.09)

1.15 (0.15)

1.74 (0.20)

DASS_3

No positive feeling at all (DM)

3.00 (0.37)

−0.79 (0.10)

0.30 (0.10)

1.22 (0.14)

DASS_5

No initiatives (LI)

1.45 (0.24)

−1.03 (0.19)

0.78 (0.19)

1.99 (0.34)

DASS_10

Had nothing to look forward to (FH)

2.39 (0.31)

−0.71 (0.12)

0.19 (0.11)

0.99 (0.15)

DASS_13

Felt down-hearted and blue (DM)

3.11 (0.35)

−1.02 (0.12)

0.20 (0.09)

1.02 (0.13)

DASS_16

Unable to become enthusiastic (LI)

1.90 (0.27)

−0.91 (0.14)

0.68 (0.15)

1.54 (0.21)

DASS_17

Wasn’t worth much as a person (FH)

2.14 (0.34)

0.11 (0.11)

1.09 (0.16)

1.73 (0.22)

DASS_21

Life was meaningless (FH)

2.54 (0.37)

−0.24 (0.10)

0.63 (0.11)

1.29 (0.16)

HADS_2

Enjoy the things I used to enjoy (LI)

1.45 (0.23)

−1.32 (0.23)

0.55 (0.16)

2.20 (0.35)

HADS_4

Laugh and see the funny side of things (LI)

2.02 (0.26)

−0.59 (0.15)

0.29 (0.12)

1.61 (0.21)

HADS_6

Feel cheerful (DM)

1.93 (0.28)

−1.89 (0.21)

0.28 (0.12)

1.69 (0.25)

HADS_8

Feel as if I am slowed down (PA)

1.27 (0.22)

−1.94 (0.30)

0.41 (0.19)

2.04 (0.37)

HADS_10

Lost interest in my appearance (LI)

0.87 (0.19)

−1.74 (0.41)

0.64 (0.27)

2.65 (0.60)

HADS_12

Look forward with enjoyment to things (LI)

1.58 (0.24)

−1.2 (0.20)

0.09 (0.14)

1.47 (0.24)

HADS_14

Enjoy good book or radio/TV program (LI)

1.16 (0.21)

−0.71 (0.21)

0.92 (0.22)

1.81 (0.35)