Year-over-year Case Group Effect* p-value
Jul 08 - Jul 09 -0.43 0.28
Aug 08 - Aug 09 -0.50 0.21
Sep 08 - Sep 09 -0.41 0.32
Oct 08 - Oct 09 -0.50 0.23
Nov 08 - Nov 09 -0.63 0.14
Dec 08 - Dec 09 -0.13 0.76
Jul 08 - Jul 10 -0.65 0.14
Aug 08 - Aug 10 -0.25 0.58
Sep 08 - Sep 10 -0.19 0.67
Oct 08 - Oct 10 -0.38 0.41
Nov 08 - Nov 10 -0.41 0.38
Dec 08 - Dec 10 -0.34 0.47
* A negative case group effect indicates that the case group decreased by a greater amount than the control group for the 1-year period under consideration.
Table 1: Effect of being a case relative to being a control for year-over-year comparisons.