Table 2 Item parameters, fit statistics, local dependence, and DIF results for the 51 PROMIS® depression items

1

I felt hopeless

4.46

0.38

0.97

1.53

2.23

116.2

88

2

I felt worthless

4.17

0.44

1.00

1.57

2.14

102.0

91

3

I felt depressed

3.84

−0.11

0.59

1.29

2.15

163.4

120

4

I felt unhappy

3.81

−0.39

0.41

1.27

2.06

151.5

120

5

I felt that nothing could cheer me up

3.73

0.32

0.94

1.73

2.34

99.4

98

6

I felt like a failure

3.73

0.19

0.72

1.58

2.05

137.2

116

7

I felt helpless

3.65

0.35

0.94

1.67

2.36

115.0

105

8

I felt that I wanted to give up on everything

3.6

0.56

1.1

1.6

2.3

111.3

95

9

I felt that I had nothing to look forward to

3.3

0.31

0.8

1.5

2.3

147.1

117

10

I felt that my life was empty

3.24

0.28

0.73

1.56

2.11

148.5

120

11

I felt emotionally exhausted

3.32

−0.18

0.49

1.27

2.05

126.0

133

12

I felt sad

3.20

−0.47

0.37

1.31

2.29

205.7

131

13

I felt I had no reason for living

3.1

0.92

1.5

1.9

2.6

83.2

71

21,29,35

14

I found that things in my life were overwhelming

3.1

−0.09

0.6

1.5

2.3

153.8

138

15

I felt that I was not needed

3.08

0.21

0.84

1.55

2.38

162.4

127

16

I felt disappointed in myself

3.05

−0.35

0.39

1.31

2.09

199.9

146

17

I felt like I needed help for my depression

3.0

0.54

1.01

1.7

2.2

150.2

105

18

I had trouble enjoying the things I used to enjoy

2.9

−0.09

0.60

1.4

2.2

165.2

146

19

I felt discouraged about the future

2.92

−0.26

0.37

1.31

2.09

159.4

153

20

I felt that I was to blame for things

2.88

−0.02

0.73

1.63

2.38

181.3

141

21

I wished I were dead and away from it all

2.8

1.01

1.5

2.1

2.6

103.3

71

13,29,35

22

I felt upset for no reason

2.83

0.23

0.93

1.85

2.93

135.3

117

23

I felt that nothing was interesting

2.83

0.06

0.87

1.90

2.64

122.1

122

24

I felt I was not as good as other people

2.8

0.15

0.80

1.6

2.3

161.5

130

25

I withdrew from other people

2.72

0.04

0.70

1.47

2.30

160.5

144

26

I had trouble making decisions

2.71

−0.16

0.75

1.66

2.57

174.8

140

32,38

27

I had trouble feeling close to people

2.66

−0.12

0.55

1.41

2.24

153.6

155

28

I felt pessimistic

2.65

−0.30

0.48

1.38

2.23

198.8

155

29

I felt that others would be better off if I were dead

2.6

1.10

1.55

2.4

3.0

70.1

67

13,21,35

30

I felt lonely

2.54

−0.09

0.60

1.45

2.21

186.0

158

31

I felt unloved

2.51

0.26

0.90

1.76

2.48

161.8

136

32

I had trouble thinking clearly

2.51

−0.15

0.78

1.84

2.84

178.7

145

26,38

33

I had mood swings

2.45

−0.32

0.56

1.42

2.32

181.8

153

34

I felt like crying

2.44

0.05

0.82

1.67

2.62

178.5

148

45

43.4

4

35

I thought about suicide

2.43

1.34

1.80

2.37

2.86

74.9

54

13,21,29

36

I felt ignored by people

2.41

−0.07

0.73

1.67

2.55

190.2

150

37

I felt guilty

2.39

0.07

0.86

1.76

2.54

160.8

139

38

I had trouble keeping my mind on what I was doing

2.4

−0.47

0.45

1.7

2.7

187.6

152

26,32

39

I felt that everything I did was an effort

2.3

−0.21

0.60

1.5

2.4

181.3

165

40

My thinking was slower than usual

2.12

−0.22

0.78

2.09

3.11

155.6

139

46

41

I felt slowed down

2.09

−0.48

0.38

1.47

2.55

226.9

168

43,44

42

I felt like being alone

1.99

−0.83

−0.19

1.09

2.37

214.8

172

43

I got tired more easily than usual

1.99

−0.56

0.24

1.37

2.39

216.3

182

41,44

44

I felt that I had no energy

1.99

−0.81

0.15

1.20

2.39

192.4

182

41,43

45

I had crying spells

1.99

0.83

1.49

2.34

3.33

122.0

109

34

34.7

4

46

I reacted slowly to things that were done or said

1.9

−0.18

0.93

2.3

3.3

160.8

143

40

47

I was unable to do many of my usual activities

1.8

0.18

1.08

2.2

3.6

193.7

146

48

I had little desire to eat

1.48

0.29

1.39

2.70

3.86

175.3

151

49

I disliked the way my body looked

1.39

−1.07

−0.31

0.87

1.82

299.4

217

76.4

4

50

I ate more than usual

1.19

−0.54

0.70

2.33

3.73

227.8

180

51

I lost weight without trying

0.57

1.90

4.24

7.03

9.39

151.8

124