IDS/QIDS
Inventory of Depressive Symptomatology (IDS) and Quick Inventory of Depressive Symptomatology (QIDS)
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INTERPRETATION

Estimated Comparisons of Total Scores

Severity1

IDS-C

IDS-SR

QIDS-C

QIDS-SR

HRSD17

HRSD21

HRSD24

MADRS

BDI

0

0-3

0–3

0

0

0

0–1

0–1

0

0

0

4-5

4–5

1

1

1–2

2

2

 

 

0

6

6

2

2

3

3

3–4

 

 

0

7-8

7–8

3

3

4

4

5

 

 

0

9-10

9–11

4

4

5–6

5–6

6–7

 

 

0

11

12–13

5

5

7

7–8

8–9

6

9

1

12-15

14–16

6

6

8

9

10–11

7

10

1

16-17

17–18

7

7

9–10

10

12

 

 

1

18-20

19–21

8

8

11

11–12

13–14

 

 

1

21-22

22–23

9

9

12

13

15–16

 

 

1

23

24–25

10

10

13

14–15

17–18

19

18

2

24-27

26–28

11

11

14–15

16

19

20

19

2

28-29

29–30

12

12

16

17

20–21

 

 

2

30-32

31–33

13

13

17

18–19

22–23

 

 

2

33-35

34–36

14

14

18–19

20–21

24–25

 

 

2

36

37–38

15

15

18–19

22

26

34

29

3

37-39

39–40

16

16

20

23

27–28

35

30

3

40-41

41–43

17

17

21–22

24–25

29–30

 

 

3

42-43

44–45

18

18

23

26

31–32

 

 

3

44-45

46–47

19

19

24

27

33

 

 

3

46

48

20

20

25

28

34

 

 

4

47-51

49–53

21

21

26–27

29–31

35–38

 

 

4

52-53

54–55

22

22

28

32

39

 

 

4

54-56

56–58

23

23

29

33–34

40–41

 

 

4

57-59

59–61

24

24

30–31

35–36

42–44

 

 

4

60-62

62–24

25

25

32

37–38

45–46

 

 

4

63-65

65–67

26

26

33–35

39–41

47–49

 

 

4

66-84

68–84

27

27

36–52

42–64

50–75

60

63

1Severity of Depression. 0=None, 1=Mild, 2=Moderate, 3=Severe, 4=Very Severe.

Note. IDS-C (Inventory of Depressive Symptoms-Clinician rated, 30 item); IDS-SR (Inventory of Depressive Symptoms-Self Report, 30 item); QIDS-C (Quick Inventory of Depressive Symptoms-Clinician rated, 16 item); QIDS-SR (Quick Inventory of Depressive Symptoms-Self Report, 16 item); HRSD (Hamilton Rating Scale for Depression, 17, 21, 24 item); MADRS (Montgomery Asberg Depression Rating Scale), Beck Depression Inventory (BDI). Adapted from (Rush et al. 2003, Trivedi et al. 2004).

Conversion Between IDS-SR and QIDS-SR, Total Scores and HRSD17, HRSD21 and HRSD24 Total Scores Using IRT Analysis
Severity1 IDS-SR QIDS-SR HRSD17 HRSD21 HRSD24

1Severity of Depression. 0=None, 1=Mild, 2=Moderate, 3=Severe, 4=Very Severe.

Note. IDS-SR (Inventory of Depressive Symptoms-Self Report, 30 item); QIDS-SR (Quick Inventory of Depressive Symptoms-Self Report, 16 item); HRSD (Hamilton Rating Scale for Depression, 17, 21, 24 item). Derived from Rush et al. 2003.