. 2021 May 26;157(8):1–8. doi: 10.1001/jamadermatol.2021.1677

Table 1. Characteristics of Studies and Populations.

Source	Country	Setting	Events	Sample size	Prevalence, %	Diagnostic method	Age group or mean age, y	Study period	Population characteristics
Kjaersgaard Andersen et al,⁵ 2020	Denmark	Clinical sample	5	195	2.56	P	12.5	2007-2015	Children with overweight and obesity and adolescents presenting at obesity clinic
Calao et al,¹⁰ 2018	Australia	Clinical sample	88	11 433	0.77	P + Q	39.4	2015-2015	All adult (≥18 y) Australian residents participating in the Single Source establishment survey run by Roy Morgan Research Ltd
Shahi et al,¹⁸ 2014	US	Population	178	139 280	0.13	P	45.2	1968-2008	All individuals at Olmstead County, Minnesota, registered in Rochester Epidemiology Project, mainly white ethnicity
Delany et al,¹¹ 2018	Ireland	Clinical sample	221	15 547	1.42	P	37	2015-2015	All consenting adults presenting at 4 hospitals in Ireland
Garg et al,¹² 2017	US	Population	47 620	45 855 960	0.10	P	All age groups	1999-2016	Population-based sample of more than 48 million unique patients across all US census regions
Garg et al,¹⁹ 2018	US	Population	1240	4 578 790	0.03	P	0-17	2014-2017	Children and adolescents registered in population database encompassing 27 participating integrated health care organizations in the US
Garg et al,²⁰ 2018	US	Population	46 860	16 813 290	0.28	P	Adults	2011-2016	Adult patients registered in population database encompassing 27 participating integrated health care organizations in the US
Ingram et al,⁴ 2018	UK	Population	33 499	4 364 308	0.77	P	NR	1994-2013	Patients presenting at primary care practices registered in UK Clinical Practice Research Datalink
Jemec et al,²¹ 1996	Denmark	Population	6	585	1.03	Q	40.7	1992-1995	Men and women 15 to 69 y of age living in this area
Jemec et al,²² 1996	Denmark	Clinical sample	20	507	3.94	P	27.15	1992-1995	Hospital sample were those came for screening of STDs
Killasli et al,²³ 2020	Sweden	Population	13 538	9 747 355	0.14	P	44.2	2001-2014	Individuals registered in National Patient Register and living in Sweden as of December 2014
Kirsten et al,²⁴ 2019	Germany	Population	791	2 319 584	0.03	P	NR	2010-2015	Adults registered at German statutory health insurance companies
Kirsten et al,⁸ 2021	Germany	Population	57	20 112	0.28	P	43.6	2014-2017	Employees in German companies
Revuz et al,²⁵ 2008	France	Population	67	6887	0.97	Q	39	2005	Individuals aged 15 y or older, representative of French population
Richard et al,²⁶ 2018	France	Population	29	20 012	0.14	Q	All age groups	2016	French general population aged more than 15 y
Theut Riis et al,⁹ 2019	Denmark	Population	500	27 765	1.80	Q	36.57	1995-2015	Individuals registered as blood donors in nationwide Danish blood donor registry
Vinding et al,²⁷ 2014	Denmark	Population	344	16 404	2.10	P	49	2010-2013	Population in Naestved Municipality registered in Danish General Suburban Population Study

Abbreviations: P, physician; NR, not reported; Q, questionnaire; STDs, sexually transmitted diseases.