Affirmative Mindfulness, Acceptance, and Compassion-based Intervention for SM

The subscale Behavioural awareness of the self-report Comprehensive assessment of Acceptance and Commitment Therapy processes - 18 Items (CompACT-18; Francis et al., 2016; Trindade et al., 2021) has 5 items that assess mindful attention to the present moment.

The subscale Openness to experience of the self-report Comprehensive assessment of Acceptance and Commitment Therapy processes - 18 Items (CompACT-18; Francis et al., 2016; Trindade et al., 2021) has 5 items that assess willingness to allow internal experiences without efforts to change it.

The Self-compassion scale of the self-report Compassion Motivation and Action Scales (CMAS; Steindl et al., 2021; Matos et al., 2023) has 18 items that assess the intent to be self-compassionate, distress tolerance during own suffering, and behaviours to alleviate this suffering.

The self-report Stigma Consciousness Questionnaire (SCQ-PT; Pinel, 1999; Seabra, Gato, et al., 2023) has 10 items that assess the extent to which sexual minority individuals focus on feel self-conscious about their stereotyped status.

The subscale Identity dissatisfaction of the self-report Lesbian, Gay, Bisexual Identity Scale (LGBIS; Mohr \& Kendra, 2011; Oliveira et al., 2012) has 6 items that assess internalized stigma.

The Sexual Minority External and Internal Shame Scale (Manão et al., 2023) has 8 items that assess shame related to sexual orientation.

The composite measure of Inadequate self and Hated self of the self-report Forms of Self-criticizing/Attacking and Self-reassuring Scale (FSCRS; Gilbert et al., 2004; Castilho et al., 2015) has 14 items that assess the experience of inadequacy and self-dislike when failures and setbacks occur. The use of this composite measure is very common in the assessment of self-criticism. Recent years research in non-clinical samples has favoured a unique global factor of self-criticism considering Inadequate self and Hated self together (Halamová et al., 2019).

The subscale Fear of compassion to others of the self-report Fears of Compassion Scale (FCS; Gilbert et al., 2011; Simões, 2012) has 10 items that assess fears, blocks, and resistances to giving compassion to others.

The subscale Fear of compassion from others of the self-report Fears of Compassion Scale (FCS; Gilbert et al., 2011; Simões, 2012) has 13 items that assess fears, blocks, and resistances to receive compassion.

The subscale Fear for compassion for self of the self-report Fears of Compassion Scale (FCS; Gilbert et al., 2011; Simões, 2012) has 15 items that assess one's fears, blocks, and resistances to self-compassion.

The subscale Anxiety symptoms of the self-report Depression Anxiety Stress Scales (Lovibond \& Lovibond, 1995; Pais-Ribeiro et al., 2004) has 7 items that assess physical arousal symptoms, panic attacks, and fear.

The subscale Depression symptoms of the self-report Depression Anxiety Stress Scales (Lovibond \& Lovibond, 1995; Pais-Ribeiro et al., 2004) has 7 items that assess symptoms usually associated with negative mood.

The self-report Social Interaction Anxiety Scale (SIAS; Mattick \& Clarke, 1998; Pinto-Gouveia \& Salvador, 2001) has 19 items that assess fears of general social interaction.

The composite measure of Activated positive affect and Relaxed positive affect of the self-report Activation and Safe/Content Affect Scale (ASCAS; Gilbert et al., 2008; Pinto-Gouveia et al., 2008) has 14 items that assess the experience of positive affect associated to resource acquisitions and achievements. This composite measure aligns with theorical affect regulation systems (Gilbert, 2010).

The subscale Safe/content positive affect of the self-report Activation and Safe/Content Affect Scale (ASCAS; Gilbert et al., 2008; Pinto-Gouveia et al., 2008) has 4 items that assess the experience of positive affect associated to safeness, caring, and contentment.

The subscale Negative affect of the self-report Positive and Negative Affect Schedule (PANAS; Watson, Clark \& Tellegen, 1988; Galinha \& Pais-Ribeiro, 2005) has 10 items that assess the experience of positive affect associated to detection and protection.