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Table 1 Description of example daily data: London 2002-2006

From: Conditional Poisson models: a flexible alternative to conditional logistic case cross-over analysis

Variable Mean Mimimum Maximum
Date (YMD)   2002.1.1 2006.12.31
Mean temperature 11.7 -1.4 28.2
Mean ozone 34.8 18.3 119.2
Number of deaths (all cause) 149.5 99 280
Strata: year X month X day-of-week   2002.1.tues 2006.12.sun