An article published in April last year has prompted debate about the interpretation of time series analyses. (MJA 2007; 186: 408-411)
To the Editor: Our comments and question relate to the interesting article by Wilson et al on asthma and chronic obstructive pulmonary disease (COPD) in Australia.1 The statistics on mortality trends for these diseases were complex, but the gist of the matter seems to relate to averaged trends for COPD and asthma over a 10-year period.
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