ISAAC Finland

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Scope

Purpose

To determine differences in the prevalence and severity of asthma and allergic diseases among 13-14 year old Finnish children and determine risk factors for asthma.

Study population Children aged 13-15 years (in grades 7 and 8) at time of survey living in

• Helsinki capital area
  • Helsinki
  • Espoo
  • Vantaa
• County of Turku and Pori
• County of Kuopio
• Southern municipalities of Lapland
  • Kolari
  • Pello
  • Ylitornio
  • Keminmaa
  • Tervola
  • Simo
  • Ranua
  • Posio
  • Kemijärvi and Salla
  • Tornio
  • Kemi
  • Rovaniemi (and surrounding rural municipality)

Survey period

• All areas except Capital area 1 November 1994 to 12 April 1995
• Capital area 11 April 1995 to 18 December 1995 without summer holiday period

Questionnaires

• Child questionnaire included video questionnaire
• Parental questionnaire

Data on residential history

• We are asking for all locations from birth to today

Exposures

• Long-term exposure to PM2.5, ozone (possibly). Possibilities include assessment of:
  • year-long average exposure during baseline year,
  • 5-year average exposure pre- or post- baseline,
  • average between birth year and baseline questionnaire year.
• Distinguish between background and specific sources, e.g. mobile sources and wood burning
• Inclusion of traffic indicator such as proximity to road and traffic density.

Outcomes

Incidence of asthma post-baseline questionnaire based on KELA register.