title: Reliability and accuracy of anthropometry performed by community health workers among infants under 6 months in rural Kenya.
abstract: OBJECTIVE
  To assess the inter-observer variability and accuracy of Mid Upper Arm Circumference (MUAC) and weight-for-length Z score (WFLz) among infants aged <6 months performed by community health workers (CHWs) in Kilifi District, Kenya.
  
  
  METHODS
  A cross-sectional repeatability study estimated inter-observer variation and accuracy of measurements initially undertaken by an expert anthropometrist, nurses and public health technicians. Then, after training, 18 CHWs (three at each of six sites) repeatedly measured MUAC, weight and length of infants aged <6 months. Intra-class correlations (ICCs) and the Pitman's statistic were calculated.
  
  
  RESULTS
  Among CHWs, ICCs pooled across the six sites (924 infants) were 0.96 (95% CI 0.95-0.96) for MUAC and 0.71 (95% CI 0.68-0.74) for WFLz. MUAC measures by CHWs differed little from their trainers: the mean difference in MUAC was 0.65 mm (95% CI 0.023-1.07), with no significant difference in variance (P = 0.075).
  
  
  CONCLUSIONS
  Mid Upper Arm Circumference is more reliably measured by CHWs than WFLz among infants aged <6 months. Further work is needed to define cut-off values based on MUAC's ability to predict mortality among younger infants.
authors.affiliation: KEMRI/Wellcome Trust Research Programme, Kilifi, Kenya. mmwangome@kilifi.kemri-wellcome.org
authors.forename: Martha K
authors.initials: MK
authors.lastname: Mwangome
authors.forename: Greg
authors.initials: G
authors.lastname: Fegan
authors.forename: Ronald
authors.initials: R
authors.lastname: Mbunya
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Prentice
authors.forename: James A
authors.initials: JA
authors.lastname: Berkley
mesh_terms: D001132:Arm; D001827:Body Height; D001835:Body Weight; D001837:Body Weights and Measures / Q000379:methods / Q000592:standards* / Q000706:statistics & numerical data*; D003150:Community Health Workers; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007223:Infant; D007630:Kenya; D008297:Male; D015588:Observer Variation; D015203:Reproducibility of Results; D012424:Rural Population / Q000706:statistics & numerical data*