title: The prevalence of underweight in 9-10-year-old schoolchildren in Liverpool: 1998-2006.
abstract: OBJECTIVE
  To estimate the prevalence of underweight between 1998 and 2006 in Liverpool schoolchildren aged 9-10 years using recently published underweight cut-off points.
  
  
  METHODS
  Stature and body mass data collected at the Liverpool SportsLinx project's fitness testing sessions were used to calculate BMI.
  
  
  METHODS
  Data were available on 26,782 (n 13,637 boys, 13,145 girls) participants.
  
  
  RESULTS
  Overall underweight declined in boys from 10.3% in 1998-1999 to 6.9% in 2005-2006, and all sub-classifications of underweight declined, in particular grade 3 underweight, with the most recent prevalence being 0.1%. In girls, the prevalence of underweight declined from 10.8% in 1998-1999 to 7.5% in 2005-2006. The prevalence of all grades of underweight was higher in girls than in boys. Underweight showed a fluctuating pattern across all grades over time for boys and girls, and overall prevalence in 2005-2006 represents over 200 children across the city.
  
  
  CONCLUSIONS
  Underweight may have reduced slightly from baseline, but remains a substantial problem in Liverpool, with the prevalence of overall underweight being relatively similar to the prevalence of obesity. The present study highlights the requirement for policy makers and funders to consider both ends of the body mass spectrum when fixing priorities in child health.
authors.affiliation: Research into Activity and Children's Health Group, Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Henry Cotton Campus, Liverpool, UK. L.M.Boddy@ljmu.ac.uk
authors.forename: Lynne M
authors.initials: LM
authors.lastname: Boddy
authors.forename: Allan F
authors.initials: AF
authors.lastname: Hackett
authors.forename: Gareth
authors.initials: G
authors.lastname: Stratton
mesh_terms: D015992:Body Mass Index; D002648:Child; D004739:England / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity / Q000453:epidemiology*; D015995:Prevalence; D011634:Public Health; D018571:Sentinel Surveillance; D013851:Thinness / Q000453:epidemiology*