title: [Association between unplanned pregnancy and adolescence onset asthma].
abstract: BACKGROUND
  The association between asthma and pregnancy has been documented previously. The relationship between unplanned pregnancy and onset asthma in adolescence has not been studied.
  
  
  OBJECTIVE
  To determine the association between unplanned pregnancy and adolescence onset asthma.
  
  
  METHODS
  A cross-sectional study was done gathering information about asthma, unplanned pregnancy, family atopy and active or passive smoking in 3,130 adolescents aged 13-19 years. Asthma diagnosis was established through a selfquestionnaire based on the International Study of Asthma and Allergy in Childhood. Odds ratios for asthma were determined using logistic regression model and chi-squared test.
  
  
  RESULTS
  Mean age of the participants was 16.37 ± 1.93 years. The prevalence of active smoking was 16.1%, of passive smoking 40% and of family atopy 9.8%. From the pregnant adolescents (785), 59.5% reported had planned not to have a child before pregnancy. Prevalence of wheezing during the year prior to the study was 9.3% and of wheezing during the pregnancy 2%. The prevalence of adolescence onset asthma was 5.4%. The age of initiation of asthma in the adolescence was 14.75 ± 1.60 years. The analysis showed that unplanned pregnancy has a slight risk for the development of asthma during adolescence. (Crude OR=1.03; CI 95% 1.02-1.05; p=0.000).
  
  
  CONCLUSIONS
  Unplanned pregnancy, family atopy, active smoking and smoking friends are associated with the onset-asthma in the adolescence.
authors.affiliation: Departamento de Investigación, Facultad de Medicina, Universidad. Autónoma de Tamaulipas, Tampico, Tamaulipas. fvazqueznava@yahoo.com.mx.
authors.forename: Francisco
authors.initials: F
authors.lastname: Vázquez-Nava
authors.forename: Bertoldo
authors.initials: B
authors.lastname: Gil-Lara
authors.forename: Leoncio
authors.initials: L
authors.lastname: Cruz-Torres
authors.forename: Carlos F
authors.initials: CF
authors.lastname: Vázquez-Rodríguez
authors.forename: Eliza M
authors.initials: EM
authors.lastname: Vázquez-Rodríguez
authors.forename: Jorge
authors.initials: J
authors.lastname: Felizardo-Ávalos
authors.forename: Arturo
authors.initials: A
authors.lastname: Llanes-Castillo
authors.forename: José A
authors.initials: JA
authors.lastname: Córdova-Fernández
mesh_terms: D000293:Adolescent; D017668:Age of Onset; D001249:Asthma / Q000453:epidemiology* / Q000209:etiology; D003430:Cross-Sectional Studies; D005191:Family Characteristics; D005260:Female; D006801:Humans; D006969:Hypersensitivity, Immediate / Q000453:epidemiology / Q000235:genetics; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology* / Q000209:etiology; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data; D049168:Pregnancy, Unplanned; D015995:Prevalence; D012135:Respiratory Sounds; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects / Q000453:epidemiology; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D014028:Tobacco Smoke Pollution / Q000009:adverse effects / Q000706:statistics & numerical data; D014505:Urban Population / Q000706:statistics & numerical data; D055815:Young Adult
chemical_list: D014028:Tobacco Smoke Pollution
keywords: Adolescence; Asthma; Unplanned pregnancy