Table 1.

Dates of exposure (heat waves) and control periods for each of 2010-2012

Exposure period	Control period 1 (Preceding)	Control period 2 (Following)
June 19–21, 2012	May 29–31, 2012	July 10–12, 2012
July 20–22, 2011	June 29–July 1, 2011	Aug 17–19, 2011
July 5–7, 2010	June 14–16, 2010	Aug 2–4, 2010