The Transgender Congruence Scale (TCS; Kozee et al., 2012) measures gender congruence via self-rating through twelve items and two subscales (congruence with appearance & acceptance of gender identity) within the past two weeks.

The Gender Congruence and Life Satisfaction Scale (GCLS; Jones et al., 2018) measures gender congruence and life satisfaction via self-rating through 38 items and seven subscales (genitals, breast, other secondary sexual characteristics, recognition of gender role, physical and emotional intimacy, physiological function and life satisfaction) with a time frame of six months.

The Brief Symptom Inventory (BSI; Derogatis and Melisaratos, 1983) measures psychiatric symptoms via self-rating with a total of 53 items in the areas of somatisation, compulsivity, insecurity in social contact, depression, anxiety, aggression, phobic fear, paranoid thinking and psychoticism. The inventory refers to a description of the symptoms within the past week.

The Short Form 36 (SF-36; Jenkinson et al., 1993) measures the health-related quality of life in the past month via self-rating with a total of 36 items, whereby it refers to the following areas: Vitality, physical functioning, physical pain, general health perception, physical role function, emotional role function, social functioning and psychological well-being.

The Patient Health Questionnaire-9 (PHQ-9; Löwe et al., 2004) measures the severity of depression symptoms via self-rating. The PHQ-9 is one of the most widely used depression questionnaires worldwide and enables the estimation of realistic basic rates of diagnosis of major depression.

The Beck Scale for Suicidal Ideation (BSSI; Beck et al., 1979) measures the degree of suicidal tendencies within the past week by self-rating with 21 items.

The questionnaire for the evaluation of psychotherapy processes (FEP-2; Lutz et al., 2009) is a self-rating instrument comprising 40 items and is used for quality assurance in psychiatric/psychotherapeutic treatments. This questionnaire covers the areas of well-being, symptom burden, interpersonal problems and incongruity within the past week.

The short form of the Barratt Impulsivity Scale (BIS-15; Meule et al., 2011) measures various forms of impulsivity (motor, planning, attention) via self-rating based on 15 items.

The Questionnaire for Empathy and Changing Perspectives (EP; Paulus, 2009) uses self-rating with a total of 18 items to determine the ability to empathize and to change perspectives in the areas of empathy, social sensitivity and prosocial behaviour.

The short version of the autism spectrum quotient (AQ-10; Sappok et al., 2015) is a screening instrument for recording autistic traits via self-rating that comprises 10 items.

The Rosenberg Self-Esteem Scale (RSES; Robins et al., 2001) measures self-esteem via self-rating with 10 items.

The Internalized Stigma of Mental Illness Inventory (ISMI-9; Hammer and Toland, 2017) measures the tendency towards self-stigmatization in psychiatric populations via self-rating with 9 items.

The Multidimensional Sexuality Questionnaire (MSQ; Snell et al., 1993) is a self-rating instrument for recording various psychological dimensions of sexuality. For economic reasons, a selection of three subscales (sexual anxiety, depression and satisfaction) will be specified in the current project. This selection comprises a total of 14 items.

The Sexual Desire Inventory (SDI; Spector et al., 1996) measures sexual desire in the past month via self-rating with 13 items. There are two different subscales for desire with and desire without social interaction (solitary and dyadic sexual desire).

This specially for the current study developed questionnaire on side effects of hormone therapy uses self-rating to record various psychological and physiological symptoms that were observed during transition treatments with gender, sexual desire and sexual desire in 23 items.

The Borderline Symptom List (BSL-23; Bohus et al., 2009) measures symptoms that typically occur in the context of borderline personality disorder via self-rating with 34 items. The time frame refers to the previous week.

The Core Autogynephilia Scale (CAS; Blanchard, 1989) meassures autogynephile tendencies via self-rating with 9 items. For the planned study, an equivalent version (Core Autoandrophilia Scale) was adapted to be able to measure autoandrophilic tendencies equally.

The OPD Structure Questionnaire Short Version (OPD-SFK; Ehrenthal et al., 2015) uses self-rating with a total of 12 items in order to measure structural abilities in the dimensions of self-perception, contact design and relationship model.

The personality inventory for DSM-5 Brief Form (PID-5 BF; Anderson et al., 2016) measures pathological personality traits via self-rating with a total of 25 items, which are described by the following subscales: Negative affectivity, closure, antagonism, disinhibition and psychoticism.

The Childhood Trauma Questionnaire (CTQ; Bernstein et al., 2003) is a self-evaluation tool suitable for retrospectively recording abuse and neglect in childhood and adolescence. The CTQ measures more than traumatic events in the narrower sense (according to DSM-IV and ICD-10). The CTQ scales include abuse (with three subscales: emotional, physical, sexual) and neglect (with two subscales: emotional and physical). The subscales consist of five items each. In addition, a further scale (three items) is provided to measure tendencies to trivialize or deny child abuse experiences. The items are rated on a 5-level scale (1-5 from 'not at all' to 'very often').

The ENRICHD Social Support Inventory (ESSI; Mitchell et al., 2003) measures the perception of social support via self-rating with 5 items.

The Perseverative Thinking Questionnaire (PTQ; Ehring et al., 2011) measures the extent of brooding thoughts via self-rating with 15 items.

The Sensation Seeking Scale-V (SSS-V; Zuckerman, 2007) measures individual differences in sensation seeking via self-rating on the basis of various dimensions, which are: Thrill and Adventure Seeking (TAS), Disinhibition (Dis), Experience Seeking (ES), and Boredom Susceptibility (BS). Each subscale contains 10 items. For economic reasons, only two subscales (TAS & ES) are used in the current project.

The Acrophobia Questionnaire (AQ; Cohen, 1977) is a self-rating questionnaire measuring acrophobia (fear of heights). The AQ describes 20 situations (e.g. standing next to an open window in an upper floor), which are often regarded by acrophobic patients as anxiety provoking and asks the extent of the anxiety (0-6) and avoidance behaviour (0-3). A total of 0-180 points can be achieved.

The Trust and Reciprocity Questionnaire (TR; Cox, 2004) measures trust and reciprocity via self-rating with 9 items.

The Client Satisfaction Questionnaire CSQ-8 (ZUF-8; Schmidt et al., 2002) is a validated self-rating questionnaire on satisfaction with treatment in psychiatric clinics. This questionnaire has been adapted for the current study so that patient satisfaction with hormone treatment is measured.