Psychoeducation for Adults With Autism and Their Significant Others/Family Members

This includes five items scored on a Likert scale ranging from 0 ("not at all") to 4 ("yes, absolutely"), with item one to three concerning the participants opinion of the content and knowledge acquired and item four to five whether it was useful to trade experiences with the other participants.

Intervention satisfaction was measured with an evaluation questionnaire after each session, a modified version of the Session evaluation form (SEF: Bramham et al., 2009; Hirvikoski et al., 2017). High values are indication of statisfaction:

• After today's lecture, my knowledge about ASD has increased
• I will benefit from what we went through on today's lecture
• The content of today's lecture felt relevant based on my own experiences
• It was helpful to be able to share my experiences with other participants
• It was helpful to take part of others experiences and tips on strategies

This includes five items scored on a Likert scale ranging from 0 ("not at all") to 4 ("yes, absolutely"), with item one to three concerning the participants opinion of the content and knowledge acquired and item four to five whether it was useful to trade experiences with the other participants.

Intervention satisfaction was measured with an evaluation questionnaire after each session, a modified version Session evaluation form (SEF: Bramham et al., 2009; Hirvikoski et al., 2017). High values are indication of statisfaction:

• After today's lecture, my knowledge about ASD has increased
• I will benefit from what we went through on today's lecture
• The content of today's lecture felt relevant based on my own experiences
• It was helpful to be able to share my experiences with other participants
• It was helpful to take part of others experiences and tips on strategies

This includes five items scored on a Likert scale ranging from 0 ("not at all") to 4 ("yes, absolutely"), with item one to three concerning the participants opinion of the content and knowledge acquired and item four to five whether it was useful to trade experiences with the other participants.

Intervention satisfaction was measured with an evaluation questionnaire after each session, a modified version of the Session evaluation form (SEF: Bramham et al., 2009; Hirvikoski et al., 2017). High values are indication of statisfaction:

• After today's lecture, my knowledge about ASD has increased
• I will benefit from what we went through on today's lecture
• The content of today's lecture felt relevant based on my own experiences
• It was helpful to be able to share my experiences with other participants
• It was helpful to take part of others experiences and tips on strategies

This includes five items scored on a Likert scale ranging from 0 ("not at all") to 4 ("yes, absolutely"), with item one to three concerning the participants opinion of the content and knowledge acquired and item four to five whether it was useful to trade experiences with the other participants.

Intervention satisfaction was measured with an evaluation questionnaire after each session, a modified version of the Session evaluation form (SEF: Bramham et al., 2009; Hirvikoski et al., 2017). High values are indication of statisfaction:

• After today's lecture, my knowledge about ASD has increased
• I will benefit from what we went through on today's lecture
• The content of today's lecture felt relevant based on my own experiences
• It was helpful to be able to share my experiences with other participants
• It was helpful to take part of others experiences and tips on strategies

To have competed the interevention was measured as attending ≥3 out of 4 sessions

(reports of inconvenience or hospitalization due to the intervention)

(reports of inconvenience or hospitalization due to the intervention)

The participants (both ASD patient and significant other) also filled out an evaluation form after the last session, a modified version of the Evaluation Questionnaire (Hesslinger et al., 2002; Hirvikoski et al., 2011), about their overall appraisal of the intervention. Higher values are indication of satisfaction. 12 items and was distributed at the end of the last session. Five items regarding the content of the intervention as a whole (i.e. all four group sessions) were scored on a Likert scale ranging from 0-4 (0=not at all, 4= yes, absolutely). ("The content of the intervention has clearly been ASC-related", "My knowledge about ASC has increased", "I am more able to cope with my ASC-related problems", "During the sessions I have been able to give my point of views", "I would attend similar intervention again").The participants also rated the course as a whole following the school grading system ''Failed,'' ''Passed,'' ''Passed with distinction,'' and ''Passed with special

The participants (patient with ASD and signifcant other) filled out an evaluation form after the last session, a modified version of the Evaluation Questionnaire (Hesslinger et al., 2002; Hirvikoski et al., 2011), about their overall appraisal of the intervention. Higher values are indication of satisfaction. 12 items and was distributed at the end of the last session. Beyond the five items mentioned above, the participants could answer four questions with open answers ("How has the intervention been helpful?", "What could be done to improve the intervention?", "Could you have done anything different?", "Is there anything else you would like to comment?")

The participants filled out an evaluation form after the last session, a modified version of the Evaluation Questionnaire (Hesslinger et al., 2002; Hirvikoski et al., 2011), about their overall appraisal of the intervention. Since it is of great importance to follow-up the participants well-being, the form contained two items where the participants rated their well-being before and after the intervention ("How would you rate your well-being prior to the intervention?", "How would you rate your current well-being") at T1 and T2 on a scale 1-10 (1= very poor, 10= very good). They could also rate the intervention as whole; answering if they considered it to be "Not approved", "Approved", "Well Approved" or "Very well Approved".

Five items: four items that measure treatment credibility and one outcome expectation. Items scored on a 10-point. Likert scale, with a total score range of 0-50. High values = high credibility.

ASD knowledge was measured using the ASD 20 Questions, a knowledge quiz with 20 true/false/don't know scored items, reflecting knowledge about ASD, which was modified for this study (Bramham et al. 2009; Hirvikoski et al 2017). Total score range from 0-20. High values = more knowledge

Active participation during the intervention will be measured with Patient Participation in Rehabilitation Questionnaire (PPRQ: Lindberg et al., 2013). The scale consists of 23 items that are rated on 5 step likert scale. High values = active participation.

Does PRISMA lead to reduced self-stigma for the adult with ASD and/or reduced affiliate stigma for the significant other? The scales we plan to use in study 3 are Internalized Stigma of mental Illness (ISMI) scale (Boyd, Adler, Otilingam & Peters, 2014). The scale consists of 29 items on a 4 step likert scale. High values = more stigma

To measure stigma in significant others, we will use Affiliate Stigma scale. This scale is new but show good psychometric properties (Mak & Cheung, 2008). The scale consists of 22 items on a 4 step likert scale. High values = more stigma

Quality of life is measured with Satisfaction with life scale (SWLS) Pavot & Diener, 1993.

Its five items are scored on a scale from 1 to 7, indicating very dissatisfied to very satisfied, with 4 as a neutral point.

What I think about my diagnosis" for patients with ASD and "What I think about my significant other diagnosis" for significant others. Both questionnaires with 7 items scored on a 7-point likert-scale raging from 1 to 7, "Always true" to "Never true" (Hirvikoski et al, 2017) and based on Acceptance and Action Questionnaire - II (Hayes et al, 2001).

The Hospital Anxiety and Depression Scale (A. S. Zigmond & Snaith, 1983) was used to measure well-being on the two subscales Depression and Anxiety containing seven items each, and scored on a 0-3 Likert-scale.

The burden of care on significant others was assessed using the Burden Assessment Scale (BAS) (Reinhard et al. 1994), a scale consisting of 19 items scored on a 4-point Likert scale from 1 ("Not at all") to 4 ("A lot").

The Questions About Family Members (QAFM) (Hansson and Jarbin 1997) constitute a dyadic self-report questionnaire, which was used to measure aspects of the quality of the relationship between the co-participants, i.e., the relationship between the adult individual with ASD and his/her significant other(s). The QAFM comprises four subscales: (1) Critical Remarks (directed at the other person); (2) (the respondent's) Emotional Over-involvement; (3) Perceived Criticism (from the other person); and (4) (perceived) Emotional Involvement (from the other person in the relationship). The 30 items are scored on a 1 ("almost never") to 5 ("almost always") Likert scale. Low scores on the first three subscales are indicative of a good quality of relationship, while on the last subscale (Emotional Involvement), high scores indicate the same.