Table 4 Construct validity and reliability of the revised SAATSA subscales

17. I am less likely to use alcohol or other drugs

0.44

Five item version = 1.82. Four item version = 0.59

Five item version = 0.99. Four item version = 0.99

Five item version = 0.05 (CI: 0.00, 0.10) Four item version = 0.01 (CI: 0.00, 0.07)

Cronbach’s α (4 item scale) = 0.72

25. I have friends who are not using alcohol or drugs

0.30

27. I know that using alcohol or drugs is a problem for me

0.83

28. I need to work on my problems with alcohol and/or drugs

0.62

29. The treatment centre is helping me to recover from using drugs and alcohol

0.74

14. My general health is improving

0.66

Five item version = 5.18. Four item version = 3.52

Five item version = 0.92. Four item version = 0.99

Five item version = 0.11 (CI: 0.07, 0.19). Four item version = 0.08 (CI: 0.04, 0.15).

Cronbach’s α (4 item scale) = 0.81

15. I am better able to cope when things go wrong

0.77

16. I am better able to accomplish the things I want to do

0.72

18. In the future I will be more likely to do better at work or at school

0.40

19. I am more likely to practice safe sex

0.59

20. There is someone who cares about whether I am doing better

0.79

Seven item version = 1.84. Six item version = 1.61

Seven item version = 0.98. Six item version = 0.99

Seven item version = 0.06. (CI: 0.02, 0.12). Six item version = 0.05 (CI: 0.00, 0.09).

Cronbach’s α (6 item scale) = 0.89

21. I have someone who will help me when I have a problem

0.84

22. I have people in my life who are a positive influence

0.76

23. The people who care about me are supportive of my treatment

0.74

24. My friends and family are more able to count on me

0.60

25. I have friends who are not using alcohol or drugs

0.36

26. I have someone who will listen to me when I need to talk

0.65

33. I am more likely to use condoms when I have sex.

0.69

Single scale = 3.27

Single scale = 0.94

Single scale = 0.07 (CI: 0.03, 0.12).

Cronbach’s α = 0.81

34. I am less likely to use alcohol and drugs before I have sex.

0.45

Two scales =1.68

Two scales =0.98

Two scales =0.04 (CI: 0.01, 0.09).

35. I am more likely to only have sex with one partner.

0.32

36. I am more likely to use condoms properly.

0.71

37. I know it’s important to know my HIV status.

0.74

38. I know where I can get tested for HIV.

0.77

39. I know where I can get treatment for HIV.

0.78

Quality scale

8. The staff at this treatment centre treat me with respect.

0.56

Seven item version = 1.51. Six item version = 0.39

Seven item version = 0.98. Six item version = 0.99

Seven item version = 0.04. (CI: 0.00, 0.08). Six item version = 0.02 (CI: 0.00, 0.05).

Cronbach’s α (6 item scale) = 0.74

9. The people I went to for treatment services spent enough time with me.

0.56

10. I have a say in deciding about my substance abuse treatment that I am receiving here

0.56

11. The staff told me about services that will help me staff off alcohol and drugs.

0.46

12. This treatment centre teaches me how to avoid getting HIV.

0.61

13. The staff at this treatment centre are sensitive to my background

0.57

30. I would recommend this treatment centre to a friend

0.62

1. The amount of time I had to wait to get services was acceptable to me.

0.67

Six item version = 3.35. Five item version = 1.60

Six item version = 0.95. Five item version = 0.99

Six item version = 0.09. (CI: 0.06, 0.13). Five item version = 0.05 (CI: 0.00, 0.10).

Cronbach’s α (5 item scale) = 0.76

3. The location of this treatment centre is convenient for me.

0.66

4. I feel safe travelling to this treatment centre.

0.69

5. It is easy for me to obtain the treatments offered by this centre.

0.71

6. My family is able to access services provided by this treatment centre.

0.59

7. I can afford the transport costs of getting to this treatment centre

0.63