Changes in substance use during outpatient treatment for substance use disorders: a prospective Norwegian cohort study from 2016 to 2020

Table 2 The Substance Use Severity Index (SUSI) (mean (SD)) at baseline and follow-up

	Baseline^a (N = 708)	Baseline^b (N = 171)	Follow-up^c (N = 171)
Alcohol	0.31 (0.29)	0.29 (0.29)	0.28 (0.27)
Cannabis	0.50 (0.38)	0.51 (0.38)	0.50 (0.40)
Benzodiazepines	0.40 (0.37)	0.42 (0.36)	0.39 (0.34)
Opioids	0.22 (0.31)	0.21 (0.31)	0.14 (0.23)
Stimulants (amphetamines and cocaine)	0.33 (0.34)	0.28 (0.31)	0.25 (0.31)
All substances	0.35 (0.20)	0.34 (0.18)	0.31 (0.18)

Each substance class and the total substance use (“All substances”) are customized into the SUSI, ranging from 0 to 1, where 0 indicates no use and 1 indicates daily use of all substances (alcohol, cannabis, benzodiazepines, opioids, and stimulants). SD: Standard Deviation
^aThe SUSI for all included patients at baseline
^bThe SUSI for patients with two or more substance use measurements at baseline
^cThe SUSI for patients with two or more substance use measurements on the last substance use assessment during the study period

ISSN: 1747-597X