Short-term effects of the 2008 cold spell on mortality in three subtropical cities in Guangdong Province, China.

The cumulative RRs based on these analyses can be interpreted as the net effects of the cold spell after accounting for mortality displacement, which is characterized by an increasing trend of cumulative RRs for exposures at lower lags (resulting in part from deaths that occurred earlier in time as a consequence of exposure) followed by a decline in cumulative RRs at higher lags (because of the relative deficit in deaths that have been displaced forward in time) ( Hajat et al. 2005 ; Roberts and Switzer 2004 ).

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