TABLE 3.

Population studies and survey data on age of acne patients with truncal involvement

STUDY	REFERENCE	MEAN AGE (MIN-MAX)	MEAN AGE (± STANDARD DEVIATION) AT ONSET OF ACNE	TRUNCAL INVOLVEMENT ACROSS AGE CATEGORIES	TRUNCAL INVOLVEMENT ACROSS SEXES	TRUNCAL INVOLVEMENT ACROSS DIFFERENT SEVERITIES
Survey 1: Online survey (Wakefield 2020) in participants with self-declared, active acne, N=2000	Unpublished	–	–	14–20-year-olds: 49% had truncal acne, 21–29-year-olds: 54% had truncal acne, 14–17-year-olds: 44% had truncal acne, 18–22-year-olds: 53% had truncal acne, 23–29-year-olds: 54% had truncal acne	Males: 52% had truncal involvement Females: 52% had truncal involvement	-Clear/mild acne: 46% had truncal involvement -Moderate/severe: 60% had truncal involvement
Survey 2: STRIDE online multi-country population-based survey of participants with a physician’s diagnosis of active acne, N=1309	Tan 20217	-Face only: 18.5 years -Face and trunk: 18.7 years	-Face only: 13.1 years -Face and trunk: 12.6 years on face and 13.1 years on trunk	<16 years 46.8% with face and trunk acne 48% with only facial acne	-Face only: Male 56.8%, Female 43.2% -Face and trunk: Male 55.5%, Female 44.5%	-Face only: 10.6% severe -Face + Trunk: 19.2% severe
Inclusion data from a prospective, international, observational phase IV study in subjects aged ≥15 years old, N=2926	Dreno 201614	22.5 ± 8.0 years	Younger onset if facial and truncal involvement 15.2 (±4) years vs face alone 16.5 (±5.2) years	–	-Overall: Male 26.9%, Female 73.1% -Face only: Male 21.5%, Female 78.5% -Face and trunk: Male 36.8%, Female 63.2% -Back and neck: Male 49.2%, Female 50.8% -Chest: Male 11%, Female 89%	–
Canadian Acne Epidemiological Survey (CAES) dermatologist-referral cohort, dermatologist-assessed, N=965	Tan 20085	25 years (13–75)	–	–	–	Prevalence and severity of acne was greater for the back than chest.
A population study based on dermatologist private practice experience in the US, N=696	Del Rosso 20074	23.1 years (10–56)	–	–	Female 63%, Male 37%	–