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Epidemiological considerations in transgender health : a systematic review with focus on higher quality data

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Abstract
Background: High quality data pertaining to the size of the transgender and gender diverse (TGD) population are scant, however, several recently published studies may provide more reliable contemporary estimates.Aims: To summarize the estimated number and proportion of TGD individuals overall and across age groups, based on most accurate data.Methods: This systematic review focused on recent studies (published from 2009 through 2019) that utilized sound methodology in assessing the proportion of TGD people in the general population. Publications were included if they used clear definitions of TGD status, and calculated proportions based on a well-defined sampling frame. Nineteen eligible publications represented two broad categories of studies: those that used data from large health care systems; and those that identified TGD individuals from population surveys.Results: Among health system-based studies, TGD persons were identified using relevant diagnostic codes or clinical notes. The proportions of individuals with a TGD-relevant diagnosis or other recorded evidence ranged between 17 and 33 per 100,000 enrollees. In population surveys TGD status was ascertained based on self-report with either narrow or broad definitions. The survey-based estimates were orders of magnitude higher and consistent across studies using similar definitions. When the surveys specifically inquired about 'transgender' identity, the estimates ranged from 0.3% to 0.5% among adults, and from 1.2% to 2.7% among children and adolescents. When the definition was expanded to include broader manifestations of 'gender diversity', the corresponding proportions increased to 0.5-4.5% among adults and 2.5-8.4% among children and adolescents. Upward temporal trends in the proportion of TGD people were consistently observed.Conclusions: Current data indicate that people who self-identify as TGD represent a sizable and increasing proportion of the general population. This proportion may differ, depending on inclusion criteria, age, and geographic location, but well-conducted studies of similar type and design tend to produce comparable results.
Keywords
HOUSEHOLD PROBABILITY SAMPLE, GENDER DYSPHORIA, POPULATION-SIZE, UNITED-STATES, SEX-RATIO, PREVALENCE, IDENTITY, ADOLESCENTS, VETERANS, SERVICE, Epidemiology, gender diverse, gender nonconforming, population, PRISMA, systematic review, transgender

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MLA
Zhang, Qi, et al. “Epidemiological Considerations in Transgender Health : A Systematic Review with Focus on Higher Quality Data.” INTERNATIONAL JOURNAL OF TRANSGENDER HEALTH, vol. 21, no. 2, 2020, pp. 125–37, doi:10.1080/26895269.2020.1753136.
APA
Zhang, Q., Goodman, M., Adams, N., Corneil, T., Hashemi, L., Kreukels, B., … Coleman, E. (2020). Epidemiological considerations in transgender health : a systematic review with focus on higher quality data. INTERNATIONAL JOURNAL OF TRANSGENDER HEALTH, 21(2), 125–137. https://doi.org/10.1080/26895269.2020.1753136
Chicago author-date
Zhang, Qi, Michael Goodman, Noah Adams, Trevor Corneil, Leila Hashemi, Baudewijntje Kreukels, Joz Motmans, Rachel Snyder, and Eli Coleman. 2020. “Epidemiological Considerations in Transgender Health : A Systematic Review with Focus on Higher Quality Data.” INTERNATIONAL JOURNAL OF TRANSGENDER HEALTH 21 (2): 125–37. https://doi.org/10.1080/26895269.2020.1753136.
Chicago author-date (all authors)
Zhang, Qi, Michael Goodman, Noah Adams, Trevor Corneil, Leila Hashemi, Baudewijntje Kreukels, Joz Motmans, Rachel Snyder, and Eli Coleman. 2020. “Epidemiological Considerations in Transgender Health : A Systematic Review with Focus on Higher Quality Data.” INTERNATIONAL JOURNAL OF TRANSGENDER HEALTH 21 (2): 125–137. doi:10.1080/26895269.2020.1753136.
Vancouver
1.
Zhang Q, Goodman M, Adams N, Corneil T, Hashemi L, Kreukels B, et al. Epidemiological considerations in transgender health : a systematic review with focus on higher quality data. INTERNATIONAL JOURNAL OF TRANSGENDER HEALTH. 2020;21(2):125–37.
IEEE
[1]
Q. Zhang et al., “Epidemiological considerations in transgender health : a systematic review with focus on higher quality data,” INTERNATIONAL JOURNAL OF TRANSGENDER HEALTH, vol. 21, no. 2, pp. 125–137, 2020.
@article{8659023,
  abstract     = {Background: High quality data pertaining to the size of the transgender and gender diverse (TGD) population are scant, however, several recently published studies may provide more reliable contemporary estimates.Aims: To summarize the estimated number and proportion of TGD individuals overall and across age groups, based on most accurate data.Methods: This systematic review focused on recent studies (published from 2009 through 2019) that utilized sound methodology in assessing the proportion of TGD people in the general population. Publications were included if they used clear definitions of TGD status, and calculated proportions based on a well-defined sampling frame. Nineteen eligible publications represented two broad categories of studies: those that used data from large health care systems; and those that identified TGD individuals from population surveys.Results: Among health system-based studies, TGD persons were identified using relevant diagnostic codes or clinical notes. The proportions of individuals with a TGD-relevant diagnosis or other recorded evidence ranged between 17 and 33 per 100,000 enrollees. In population surveys TGD status was ascertained based on self-report with either narrow or broad definitions. The survey-based estimates were orders of magnitude higher and consistent across studies using similar definitions. When the surveys specifically inquired about 'transgender' identity, the estimates ranged from 0.3% to 0.5% among adults, and from 1.2% to 2.7% among children and adolescents. When the definition was expanded to include broader manifestations of 'gender diversity', the corresponding proportions increased to 0.5-4.5% among adults and 2.5-8.4% among children and adolescents. Upward temporal trends in the proportion of TGD people were consistently observed.Conclusions: Current data indicate that people who self-identify as TGD represent a sizable and increasing proportion of the general population. This proportion may differ, depending on inclusion criteria, age, and geographic location, but well-conducted studies of similar type and design tend to produce comparable results.},
  author       = {Zhang, Qi and Goodman, Michael and Adams, Noah and Corneil, Trevor and Hashemi, Leila and Kreukels, Baudewijntje and Motmans, Joz and Snyder, Rachel and Coleman, Eli},
  issn         = {2689-5269},
  journal      = {INTERNATIONAL JOURNAL OF TRANSGENDER HEALTH},
  keywords     = {HOUSEHOLD PROBABILITY SAMPLE,GENDER DYSPHORIA,POPULATION-SIZE,UNITED-STATES,SEX-RATIO,PREVALENCE,IDENTITY,ADOLESCENTS,VETERANS,SERVICE,Epidemiology,gender diverse,gender nonconforming,population,PRISMA,systematic review,transgender},
  language     = {eng},
  number       = {2},
  pages        = {125--137},
  title        = {Epidemiological considerations in transgender health : a systematic review with focus on higher quality data},
  url          = {http://dx.doi.org/10.1080/26895269.2020.1753136},
  volume       = {21},
  year         = {2020},
}

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