title: Psoriasis in Children and Adolescents: Epidemiological Study of 280 Patients from Mexico.
abstract: BACKGROUND
  Psoriasis in children and adolescents has not been well studied in Mexico.
  
  
  OBJECTIVE
  To study the epidemiological characteristics of psoriasis in this age group.
  
  
  METHODS
  This is a retrospective study in an academic, tertiary care dermatology center from January 1999 to December 2014. We included patients ≤ 18 years of age, with clinical and histopathological diagnosis of psoriasis. We recorded the following information: gender, age, disease duration, clinical variant, nail involvement, treatment, and family history. Descriptive and inferential statistics were used for analysis.
  
  
  RESULTS
  Of 2,491 patients with psoriasis, 280 were ≤ 18 years of age, resulting in a prevalence of 11%. There was female predominance and the mean age was 11.5 years. Disease duration was 18 ± 34 months. Plaque psoriasis was the most common form, comprising 191 cases (68%). Nail involvement occurred in only 15 patients (5%). Topical treatment was given to 177 patients (63%). Only 14 cases (5%) had a family history of psoriasis. These variables did not differ when children were compared with adolescents, except in those with a shorter disease duration (13 ± 19 vs. 24 ± 29 months; p = 0.0004).
  
  
  CONCLUSIONS
  We found a higher prevalence of psoriasis than previously published studies in this age group and a lower frequency of nail involvement and family history of psoriasis.
authors.affiliation: Department of Dermatology, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
authors.forename: Andrea
authors.initials: A
authors.lastname: Tovar-Garza
authors.affiliation: Instituto Dermatológico de Jalisco "Dr. José Barba Rubio", Jalisco Ministery of Health, Zapopan, Jal., Mexico.
authors.forename: Mayela
authors.initials: M
authors.lastname: Meza-Resendiz
authors.affiliation: Instituto Dermatológico de Jalisco "Dr. José Barba Rubio", Jalisco Ministery of Health, Zapopan, Jal., Mexico.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Guevara-Gutiérrez
authors.affiliation: Instituto Dermatológico de Jalisco "Dr. José Barba Rubio", Jalisco Ministery of Health, Zapopan, Jal., Mexico.
authors.forename: Juan Gabriel
authors.initials: JG
authors.lastname: Barrientos-García
authors.affiliation: UMAE Hospital de Pediatría, Centro Médico Nacional de Occidente, Instituto Mexicano del Seguro Social, Guadalajara, Jal, Mexico.
authors.forename: Alberto
authors.initials: A
authors.lastname: Tlacuilo-Parra
mesh_terms: D000279:Administration, Cutaneous; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003879:Dermatologic Agents / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008800:Mexico / Q000453:epidemiology; D009260:Nail Diseases / Q000453:epidemiology* / Q000473:pathology; D015995:Prevalence; D011565:Psoriasis / Q000188:drug therapy / Q000453:epidemiology* / Q000473:pathology; D012189:Retrospective Studies
chemical_list: D003879:Dermatologic Agents