Secular trend in the occurrence of asthma among children and young adults: critical appraisal of repeated cross sectional surveys

@article{Magnus1997SecularTI,
  title={Secular trend in the occurrence of asthma among children and young adults: critical appraisal of repeated cross sectional surveys},
  author={Per M. Magnus and Jouni J. K. Jaakkola},
  journal={BMJ},
  year={1997},
  volume={314 7097},
  pages={
          1795-9
        }
}
OBJECTIVES To review repeated surveys of the rising prevalence of obstructive lung disease among children and young adults and determine whether systematic biases may explain the observed trends. DESIGN Review of published reports of repeated cross sectional surveys of asthma and wheezing among children and young adults. The repeated surveys used the same sampling frame, the same definition of outcome variables, and equivalent data collection methods. SETTING Repeated surveys conducted… CONTINUE READING
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