title: [Analysis on 2011 quality control results on aerobic plate count of microbiology laboratories in China].
abstract: OBJECTIVE
  To test the aerobic plate count examining capability of microbiology laboratories, to ensure the accuracy and comparability of quantitative bacteria examination results, and to improve the quality of monitoring.
  
  
  METHODS
  The 4 different concentration aerobic plate count piece samples were prepared and noted as I, II, III and IV. After homogeneity and stability tests, the samples were delivered to monitoring institutions. The results of I, II, III samples were logarithmic transformed, and evaluated with Z-score method using the robust average and standard deviation. The results of IV samples were evaluated as "satisfactory" when reported as < 10 CFU/piece or as "not satisfactory" otherwise. Pearson χ2 test was used to analyze the ratio results.
  
  
  RESULTS
  309 monitoring institutions, which was 99.04% of the total number, reported their results. 271 institutions reported a satisfactory result, and the satisfactory rate was 87.70%. There was no statistical difference in satisfactory rates of I, II and III samples which were 81.52%, 88.30% and 91.40% respectively. The satisfactory rate of IV samples was 93.33%. There was no statistical difference in satisfactory rates between provincial and municipal CDC.
  
  
  CONCLUSIONS
  The quality control program has provided scientific data that the aerobic plate count capability of the laboratories meets the requirements of monitoring tasks.
authors.forename: Haihong
authors.initials: H
authors.lastname: Han
authors.forename: Ning
authors.initials: N
authors.lastname: Li
authors.forename: Yepeng
authors.initials: Y
authors.lastname: Li
authors.forename: Ping
authors.initials: P
authors.lastname: Fu
authors.forename: Dongmin
authors.initials: D
authors.lastname: Yu
authors.lastname: Li Zhigang
authors.forename: Chunming
authors.initials: C
authors.lastname: Du
authors.forename: Yunchang
authors.initials: Y
authors.lastname: Guo
mesh_terms: D001419:Bacteria / Q000254:growth & development / Q000302:isolation & purification*; D002681:China; D019411:Clinical Laboratory Techniques / Q000592:standards*; D015169:Colony Count, Microbial / Q000379:methods* / Q000592:standards; D007753:Laboratories / Q000592:standards; D011786:Quality Control