Table 4 Depression (PHQ-9) and anxiety (GAD-7) scores by number of IM ketamine treatments received

 All treatment lengths

112

16.0 (11.3–21.8)

10.0 (6.0–15.0)

<.001

 Patients with 1 treatment

66

13.5 (8.0–21.0)

N/A

N/A

 Patients with 2–4 treatments

30

15.0 (7.8–21.0)

12.0 (5.8–15.0)

<.001

 Patients with 5–6 treatments

38

17.0 (12.5–22.5)

9.0 (6.0–13.0)

<.001

 Patients with 7–10 treatments

29

15.0 (11.5–22.0)

10.0 (7.0–15.0)

.001

 Patients with 11–48 treatments

15

20.0 (15.0–24.0)

11.0 (6.0–13.0)

<.001

 All treatment lengths

80

14.0 (8.0–17.0)

7.0 (4.3–11.8)

<.001

 Patients with 1 treatment

50

10.5 (6.0–16.0)

N/A

N/A

 Patients with 2–4 treatments

24

10.0 (7.0–14.8)

8.0 (7.8–13.8)

.061

 Patients with 5–6 treatments

26

15.5 (11.0–17.0)

7.0 (4.0–11.3)

<.001

 Patients with 7–10 treatments

20

10.5 (6.0–18.3)

7.5 (5.0–9.8)

.006

 Patients with 11–48 treatments

10

17.5 (15.5–18.3)

8.5 (5.3–11.0)

.003