title: Body composition unaltered for African women classified as 'normal but vulnerable' by body mass index and mid-upper-arm-circumference criteria.
abstract: OBJECTIVE
  To test the hypothesis that 'normal but vulnerable' adults, as defined by body mass index (BMI) in combination with mid-upper-arm-circumference (MUAC), are closer to normal than to malnourished ones. For that purpose body composition measurements were compared between normal and low BMI categories and according to MUAC value in an African context and for different age groups.
  
  
  METHODS
  Reanalysis of data from a previous cross-sectional cluster sample nutrition survey.
  
  
  METHODS
  A rural area of the Republic of Congo, Central Africa.
  
  
  METHODS
  A representative sample (n=544) of non-pregnant women.
  
  
  METHODS
  Arm muscle area was calculated from measurements of triceps skinfold thickness and MUAC. Peripheral body fat was assessed by the sum of four skinfold thicknesses. The ratio of resistance at high and low frequencies was derived from whole body measurement of multifrequency bioelectrical impedance analysis and used as the extracellular to total body water ratio index.
  
  
  RESULTS
  The prevalence of thinness decreased from 18.7% as defined by BMI alone to 9.0% as defined by BMI and MUAC. This difference was due to the group of subjects classified as 'normal but vulnerable' (9.7%). Prevalence of thinness increased with age when assessed by BMI alone, but no longer when assessed by BMI and MUAC. Comparison with the BMI> or =18.5 kg/m(2) category showed that in 'normal but vulnerable' subjects lower BMI was accompanied by lower both fat and lean compartments, in absolute values, but the equilibrium of body water compartments was not altered. In BMI<18.5 women, low MUAC was associated with altered lean tissues, at peripheral and whole body level, whereas fat tissue did not differ.
  
  
  CONCLUSIONS
  'Normal but vulnerable' subjects appeared as 'thin but healthy' rather than malnourished, at all ages, even though their BMI was lower than 18.5 kg/m(2). The new classification of thinness based on BMI and MUAC provides a more specific index of nutritional status when restricting the thin category to more at-risk subjects.
authors.affiliation: Nutrition Unit, IRD (Institut de Recherche pour le Développement), WHO Collaborating Center for Nutrition, Montpellier, France. gartner@dakar.ird.sn
authors.forename: A
authors.initials: A
authors.lastname: Gartner
authors.forename: B
authors.initials: B
authors.lastname: Maire
authors.forename: Y
authors.initials: Y
authors.lastname: Kameli
authors.forename: P
authors.initials: P
authors.lastname: Traissac
authors.forename: F
authors.initials: F
authors.lastname: Delpeuch
mesh_terms: D000273:Adipose Tissue; D000293:Adolescent; D000328:Adult; D001132:Arm / Q000033:anatomy & histology; D001823:Body Composition; D015992:Body Mass Index; D001834:Body Water; D016000:Cluster Analysis; D003223:Congo / Q000453:epidemiology; D003430:Cross-Sectional Studies; D017097:Electric Impedance; D005260:Female; D006801:Humans; D008875:Middle Aged; D009748:Nutrition Disorders / Q000453:epidemiology; D009749:Nutrition Surveys; D009752:Nutritional Status; D015995:Prevalence; D012423:Rural Health; D012885:Skinfold Thickness; D013851:Thinness / Q000453:epidemiology*