Table 1.

Measures used in Trans20 in parent, patient and in-clinic questionnaires

Construct	Instrument	Reference	Parent Q’aire	Patient Q’aire	In-clinic Q’aire	Age range*
Demographics and history
Demographics	Introducing you	T20 PT, 27 28	√	√		Parent report: all ages—no age restrictions while patient at RCHGS† Patient report: all ages—no age restrictions
Medical history	Medical and developmental history	T20 PT	√	√		Parent report: all ages—no age restrictions while patient at RCHGS† Patient report: 18+
Gender
Gender identity and supports	About your gender—gender slider	T20 PT		√		All ages—no age restrictions
Social transitioning	About socially transitioning	T20 PT	√	√		Parent report: 0–7 Patient report: 8+
Voice	About your voice	32 33		√		12+
Gender role behaviours and gender identity	Gender Identity Questionnaire	29	√			<=12
Gender dysphoria	Single item measuring recent gender-related distress	T20 PT		√		All ages—no age restrictions
Gender dysphoria: gender preoccupation and gender stability	Gender Preoccupation and Stability Questionnaire	30		√		11+
Body image	Body Image Scale	31		√	√	12+
Chest dysphoria	Chest Dysphoria Scale	15		√		12+ (birth-assigned females)
Hormone treatment experiences‡	Medical intervention treatment effects and satisfaction. Tanner’s Sexual Maturation Scale	T20 PT, 71–73		√		12+ for those reporting that they have started puberty suppression or gender affirming hormones
Mental health
Internalising and externalising behaviour	Youth Self Report	34		√		11–18
	Preschool Child Behavior Checklist	35	√			1.5–5
	School-age Child Behavior Checklist	34	√			6–18
Anxiety symptomatology	Spence Children's Anxiety Scale—Preschool	37	√			3–5
	Spence Children's Anxiety Scale—Parent report	38	√			6–18
	Spence Children's Anxiety Scale—Self report	39–41		√		7–18
Eating disorders	Branched Eating disorder Test	48		√		12+
Depressive symptomatology	Short Mood and Feelings Questionnaire	36	√	√		Parent report: all ages—no age restrictions while patient at RCHGS†. Patient report: 7+
Depression, anxiety and stress	DASS21	42		√		18+
Social phobia	Social Phobia Scale	43		√		18+
Resilience: pride and connectedness	The Gender Minority Stress and Resilience Measure	44		√		12+
Resilience	The Brief Resilience Scale	45		√		8+
Self-harm	Self-harm questions based on Hawton et al (2002)	46		√	√	12+
Suicidality	Columbia-Suicide Severity Rating Scale	47		√	√	12+
Autism features§	Social Responsiveness Scale 2: School-age form	50	√			4–18
School functioning
School attendance	About school (school type, attendance)	52	√	√		Parent report: all ages—no age restrictions while patient at RCHGS† Patient report: 18+
Academic performance	School-age Child Behavior Checklist	34	√			6–18
School connectedness	Psychological Sense of School Membership Survey	51		√		12–18
Bullying and discrimination
Bullying	Gatehouse Bullying Scale	53		√		8–18
Discrimination	Adapted from the Victorian Population Health Survey	54	√		18+
Family functioning
Family functioning	Family Assessment Device—General Functioning scale	61 62	√	√		Parent report: all ages—no age restrictions while patient at RCHGS† Patient report: 12+
Quality of life
Quality of life (patient)	Child Health Utility 9D	55 56	√	√		Parent report: ≤5 Patient report: 6+
	AQoL-4D	57 58		√		18+
Parental quality of life	AQoL-4D	57 58	√			All ages—no age restrictions while patient at RCHGS†
Drug use and sexual health
Health risk behaviours	Tobacco, alcohol and drug use	63–66		√	√	12+
Sexuality	Attraction and relationship questions. Adapted from the Victorian Population Health Survey	T20 PT, 54		√	√	12+
Clinical experiences
Discharge status‡	Reasons for discharging from RCHGS	T20 PT	√	√		For those discharged from RCHGS Parent report: ≤11 Patient report: 12+
Experiences of care‡	RCHGS experiences of care	67–70	√	√		Parent report: all ages—no age restrictions while patient at RCHGS† Patient report: 12+

*Age range refers to the age of TGD youth at which questionnaires are asked of either the TGD youth and/or their parent.

†Not administered to parent if young person is aged 18 years (or older) and discharged from RCHGS.

‡Only asked at follow-up assessments.

§Only asked at initial assessment.

AQoL, The Assessment of Quality of Life; DASS21, Depression Anxiety Stress Scales-21; Q’aire, Questionnaire; TGD, transgender and gender diverse; T20 PT, Trans20 project team devised questions.