TY - JOUR
T1 - The Epidemiology of Hospital-Treated Alopecia Areata in Denmark, 1995–2016
AU - Sørensen, Sissel Brandt Toft
AU - George, Prethibha
AU - Jagun, Oladayo
AU - Wolk, Robert
AU - Napatalung, Lynne
AU - Zwillich, Samuel H.
AU - Iversen, Lars
AU - Ehrenstein, Vera
N1 - Publisher Copyright:
© The Author(s) 2024.
PY - 2024/4
Y1 - 2024/4
N2 - Introduction: Alopecia areata (AA) is an autoimmune skin disease presenting as nonscarring hair loss. Information on the epidemiology of AA, especially the occurrence of AA and its subtypes within the general population, is scarce. The study aimed to estimate the incidence rates and prevalence of hospital-treated AA and its subtypes in Denmark and to examine the demographic and clinical characteristics of patients with AA, including comorbidities and use of prescription medications. Methods: This was a cohort study based on data from administrative and health registers in Denmark in 1995–2016. The study included individuals who were (1) registered with a hospital inpatient or hospital-based outpatient clinic diagnosis of AA between 1995 and 2016 in the Danish National Patient Registry covering encounters at all Danish hospitals, (2) alive and resided in Denmark anytime between 1995 and 2016, (3) aged ≥ 12 years, and (4) resided uninterrupted in Denmark during the 12 months before the first AA diagnosis during the study period. Results: During the study period, 2778 individuals with an incident hospital-based diagnosis of AA were identified; 63.1% were female and 28.7% of the patients were aged ≥ 50 years. Over the study period, the overall incidence rate for any hospital-treated AA per 100,000 person-years was 2.62 (95% confidence interval [CI], 2.53–2.72), and the overall prevalence in 2016 was 71.7 (95% CI 69.4–74.1) per 100,000 persons. Both incidence rate and prevalence increased over time. Prevalence of most hospital-treated comorbidities or history of medication use was below 10% and was similar in the alopecia totalis (AT)/alopecia universalis (AU) and non-AT/AU subtypes of AA. Conclusion: This cohort study reported incidence rates and prevalence over time and characteristics of individuals with hospital-treated AA in Denmark, which are in agreement with those previously reported in this population.
AB - Introduction: Alopecia areata (AA) is an autoimmune skin disease presenting as nonscarring hair loss. Information on the epidemiology of AA, especially the occurrence of AA and its subtypes within the general population, is scarce. The study aimed to estimate the incidence rates and prevalence of hospital-treated AA and its subtypes in Denmark and to examine the demographic and clinical characteristics of patients with AA, including comorbidities and use of prescription medications. Methods: This was a cohort study based on data from administrative and health registers in Denmark in 1995–2016. The study included individuals who were (1) registered with a hospital inpatient or hospital-based outpatient clinic diagnosis of AA between 1995 and 2016 in the Danish National Patient Registry covering encounters at all Danish hospitals, (2) alive and resided in Denmark anytime between 1995 and 2016, (3) aged ≥ 12 years, and (4) resided uninterrupted in Denmark during the 12 months before the first AA diagnosis during the study period. Results: During the study period, 2778 individuals with an incident hospital-based diagnosis of AA were identified; 63.1% were female and 28.7% of the patients were aged ≥ 50 years. Over the study period, the overall incidence rate for any hospital-treated AA per 100,000 person-years was 2.62 (95% confidence interval [CI], 2.53–2.72), and the overall prevalence in 2016 was 71.7 (95% CI 69.4–74.1) per 100,000 persons. Both incidence rate and prevalence increased over time. Prevalence of most hospital-treated comorbidities or history of medication use was below 10% and was similar in the alopecia totalis (AT)/alopecia universalis (AU) and non-AT/AU subtypes of AA. Conclusion: This cohort study reported incidence rates and prevalence over time and characteristics of individuals with hospital-treated AA in Denmark, which are in agreement with those previously reported in this population.
KW - Alopecia areata
KW - Epidemiology
KW - Incidence rates
UR - http://www.scopus.com/inward/record.url?scp=85190495127&partnerID=8YFLogxK
U2 - 10.1007/s13555-024-01145-9
DO - 10.1007/s13555-024-01145-9
M3 - Article
AN - SCOPUS:85190495127
SN - 2190-9172
VL - 14
SP - 993
EP - 1006
JO - Dermatology and Therapy
JF - Dermatology and Therapy
IS - 4
ER -