title: A case control study in the Indian subcontinent ethnic population on the effect of return visits and the subsequent development of tuberculosis.
abstract: METHODS
  A local government area in North West England with a significant population of Indian subcontinent (ISC) ethnic origin and a high incidence of tuberculosis.
  
  
  OBJECTIVE
  To assess whether return visits to the ISC are associated with an increased risk of developing clinical tuberculosis.
  
  
  METHODS
  Analysis of data prospectively obtained from ISC patients diagnosed with TB in 1998-2002 (cases) and age and sex matched ISC patients in two local GP practices (controls).
  
  
  RESULTS
  There is at best weak evidence of association between case status and whether individuals have had a repeat visit to the subcontinent within 3 years of notification in this cohort; odds ratio 1.26 (95% CI (0.95, 1.76)); Fishers exact test P=0.09.
authors.affiliation: Department of Respiratory Medicine, Chest Clinic, Blackburn Royal Infirmary, Blackburn BB2 3LR, UK.
authors.forename: H
authors.initials: H
authors.lastname: Singh
authors.forename: M
authors.initials: M
authors.lastname: Joshi
authors.forename: L P
authors.initials: LP
authors.lastname: Ormerod
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D016022:Case-Control Studies; D016009:Chi-Square Distribution; D006801:Humans; D007194:India / Q000208:ethnology; D016017:Odds Ratio; D011446:Prospective Studies; D012307:Risk Factors; D011795:Surveys and Questionnaires; D013997:Time Factors; D014195:Travel; D014376:Tuberculosis / Q000453:epidemiology* / Q000208:ethnology; D006113:United Kingdom / Q000453:epidemiology