title: Body composition in 995 acutely ill or chronically ill patients at hospital admission: a controlled population study.
abstract: OBJECTIVE
  To determine if fat-free mass and fat mass in acutely ill and chronically ill patients differed from healthy controls at hospital admission and if prevalence of malnutrition differed by body mass index (BMI) or fat-free mass percentile.
  
  
  METHODS
  995 consecutive patients 15 to 100 years of age admitted to the hospital were measured in the hospital admission center and compared with 995 healthy age- and height-matched subjects
  
  
  METHODS
  Cross-sectional study. Fat-free mass, fat mass, and percentage fat mass were determined by 50 kHz bioelectrical impedance analysis. Prevalence of malnutrition was determined by BMI < or = 20 kg/m2 or fat-free mass in the 10th percentile.
  
  
  METHODS
  Analysis of variance was used to examine differences between acutely ill and chronically ill patients and controls and between age groups.
  
  
  RESULTS
  Fat-free mass was significantly lower in patients than controls (P< or = .05), and the difference with age in fat-free mass in patients was greater than the age-related difference in the controls. A higher percentage fat mass was found in spite of lower BMI in chronically ill patients older than 55 years. Among participants, 25% of acutely ill and 37.3% of chronically ill patients fell below fat-free mass in the 10th percentile, compared with 15.6% of acutely ill and 18.9% of chronically ill patients falling below BMI < or = 20 kg/m2.
  
  
  CONCLUSIONS
  Weight and BMI do not evaluate body compartments and therefore do not reveal if weight changes result in loss of fat-free mass or gain in fat mass. In spite of minimal differences in BMI between patients and controls, we found that fat-free mass was lower and fat mass was higher in acutely ill and chronically ill patients than controls. The objective measurement of body composition, as part of a comprehensive nutritional assessment, helps to identify subjects who have low fat-free mass or high fat mass.
authors.affiliation: Clinical Nutrition Department, Geneva University Hospital, Switzerland.
authors.forename: Ursula G
authors.initials: UG
authors.lastname: Kyle
authors.forename: Pierre
authors.initials: P
authors.lastname: Unger
authors.forename: Yves M
authors.initials: YM
authors.lastname: Dupertuis
authors.forename: Veronique L
authors.initials: VL
authors.lastname: Karsegard
authors.forename: Laurence
authors.initials: L
authors.lastname: Genton
authors.forename: Claude
authors.initials: C
authors.lastname: Pichard
mesh_terms: D000208:Acute Disease; D000273:Adipose Tissue / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D001823:Body Composition / Q000502:physiology*; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology; D016022:Case-Control Studies; D002908:Chronic Disease; D003430:Cross-Sectional Studies; D017097:Electric Impedance; D005260:Female; D006760:Hospitalization; D006801:Humans; D008297:Male; D008875:Middle Aged; D015596:Nutrition Assessment; D009748:Nutrition Disorders / Q000175:diagnosis / Q000453:epidemiology*; D009752:Nutritional Status; D015995:Prevalence; D014481:United States / Q000453:epidemiology