title: Monitoring population disability: evaluation of a new Global Activity Limitation Indicator (GALI).
abstract: OBJECTIVE
  To evaluate a single item instrument, the Global Activity Limitation Indicator (GALI), to measure long-standing health related activity limitations, against several health indicators: a composite morbidity indicator, instruments measuring mental health (SCL-90R, GHQ-12), physical co-morbidity and physical limitations (ADLs, SF-36).
  
  
  METHODS
  Cross-sectional data (n = 9168) of the 2001-National Health Interview Survey in Belgium was used to compare the GALI with other health indicators across gender, age, educational attainment and language.
  
  
  RESULTS
  Responses to the GALI were similar to responses to other indicators of physical limitations (Limitations in Activities of Daily Living (by severity or by number of limitations), the SF-36 physical domain), to an indicator of chronic physical comorbidity and to indicators of mental health. The probability of reporting absence of long-standing activity limitation with the GALI was high in subjects without physical limitations or physical or mental conditions. This probability decreased as the severity or number of limitations, the number of physical or mental conditions increased.
  
  
  CONCLUSIONS
  The GALI performs appropriately against other health indicators and appears to reflect long-standing activity limitation associated with both mental and physical conditions.
authors.affiliation: Unit of Epidemiology Scientific Institute of Public Health, Brussels, Belgium. h.vanoyen@iph.fgov.be
authors.forename: Herman
authors.initials: H
authors.lastname: van Oyen
authors.forename: Johan
authors.initials: J
authors.lastname: Van der Heyden
authors.forename: Rom
authors.initials: R
authors.lastname: Perenboom
authors.forename: Carol
authors.initials: C
authors.lastname: Jagger
mesh_terms: D000203:Activities of Daily Living / Q000145:classification*; D000293:Adolescent; D000328:Adult; D000368:Aged; D001530:Belgium; D015897:Comorbidity; D003430:Cross-Sectional Studies; D004185:Disability Evaluation; D006233:Persons with Disabilities / Q000706:statistics & numerical data*; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D028642:Persons with Psychiatric Disorders / Q000706:statistics & numerical data*; D008875:Middle Aged; D011159:Population Surveillance; D015203:Reproducibility of Results