Table 2. Pre/post analysis for bundle trusts.

	7 day readmissions	28 day readmissions	90 day readmissions	Number of bed-days
Mean annual number (SD), 2002–2012	209.1 (59.4)	562.8 (144.9)	1,014 (243.2)	27,769.4 (3,419.4)
Annual trend in COPD admissions pre October 2009 1	+2.7% (0.019)	+2.1% (0.002)	+1.4% (0.007)	-0.8 (<0.001)
Annual trend in COPD admissions post October 2009 2	-7.6% (0.028)	-5.3% (0.012)	-1.3% (0.267)	-1.6 (<0.001)

¹ P-value refers to difference of this trend from zero

² P-values refer to difference between this trend and pre-implementation trend