Table 2 Subgroup analysis of baseline characteristics of young people in residential substance use disorder treatment (Cohort B) 2018–2020: Lost to 12-month follow-up vs. 12-month follow-up completers

Age (M, SD)^a

20.7 (2.0)

20.5 (1.8)

.781

Gender (n, % male)^a

55 (72.4)

19 (79.2)

.508

Education (completed school years; M, SD)^a

10.6 (1.0)

10.2 (1.4)

.117

 Completed further study (n, %)#

1.0

  Technical/Trade Certificate

14 (93.3)

4 (100.0)

  Bachelor-level College

1 (6.7)

0 (0)

Employment status (n, %)^a

.374

 Unemployed

49 (64.5)

17 (70.8)

 Full- or part-time employment

22 (28.9)

4 (16.7)

 Receiving pension or allowance

5 (6.6)

3 (12.5)

Accommodation (n, %)^a

.777

  (Residing with) rental tenant/home owner

62 (81.6)

18 (75.0)

 Homeless

9 (11.8)

4 (16.7)

 Inpatient, forensic setting, hostel, other

5 (6.6)

2 (8.3)

Relationship status (n, % single)^a

60 (78.9)

18 (75.0)

.684

Primary problematic substance (n, %)^b

.787

 Cannabis

26 (34.7)

12 (52.2)

 Amphetamine-type stimulants

26 (34.7)

5 (21.7)

 Alcohol

11 (14.7)

4 (17.4)

 Cocaine

4 (5.3)

0

 Sedatives

3 (4.0)

1 (4.3)

 Heroin

2 (2.7)

1 (4.3)

 Hallucinogens

1 (1.3)

0

 Steroids

1 (1.3)

0

 Nicotine

1 (1.3)

0

Injected during last 3 months (n, %)^c#

4 (7.0)

1 (5.9)

1.0

Overdosed (any drug) last 3 months (n, %)^c#

15 (26.3)

6 (35.3)

.544

Arrested in the last 3 months (n, %)^c#

10 (17.5)

3 (17.6)

1.0

 Global Severity Index

66.7 (12.4)

71.4 (9.7)

.125

 Positive Symptoms Distress Index

63.0 (8.8)

67.5 (10.2)

.059

 Positive Symptoms Total

64.3 (10.1)

68.3 (8.8)

.118

 Somatisation

60.4 (12.1)

67.3 (9.0)

.022*

 Obsessive Compulsive

67.1 (10.2)

71.6 (8.7)

.083

 Interpersonal Sensitivity

61.4 (12.8)

66.8 (13.1)

.110

 Depression

65.0 (11.1)

68.6 (11.6)

.216

 Anxiety

65.3 (12.3)

69.6 (9.5)

.161

 Hostility

59.2 (10.6)

61.6 (12.6)

.416

 Phobic Anxiety

62.6 (10.7)

67.4 (9.9)

.081

 Paranoid Ideation

62.6 (12.0)

65.7 (11.1)

.310

 Psychoticism

68.3 (10.9)

71.4 (10.1)

.270

Brief Situational Confidence Questionnaire (M, SD)^e

45.9 (25.2)

42.2 (24.1)

.573

Severity of Dependence Scale (M, SD)^f

9.1 (3.1)

10.4 (2.7)

.127

World Health Organisation Quality of Life-8 (M, SD)^g

3.3 (0.7)

2.8 (0.9)

.007**