TABLE 2.

Unadjusted Changes in Adherence by Treatment Group

	Oral Antidiabetics			Antihypertensives			Statins
	Intervention n = 1,277	Control n = 4,144	P Value	Intervention n = 4,787	Control n = 14,733	P Value	Intervention n = 4,382	Control n = 14,862	P Value
PDC, mean
Preperiod,a %	87.6	89.5		88.5	90.8		87.2	88.9
Postperiod,b %	89.1	90.3		89.9	90.2		88.5	88.4
Difference (preperiod to postperiod)c	1.5	0.8	0.206	1.4	-0.6	< 0.001	1.3	-0.5	< 0.001
Difference-in-differenced	+0.7			+2.0			+1.8
PDC ≥ 80, %
Preperiod,a %	78.6	80.3		80.2	85.2		78.1	81.1
Postperiod,b %	81.7	83.6		82.8	83.9		80.9	80.3
Difference (preperiod to postperiod)c	3.1	3.3	0.178	2.6	-1.3	< 0.001	2.8	-0.8	0.090
Difference-in-differenced	-0.2			+3.9			+3.6

Note: T-tests used to assess statistical difference between treatment groups for the continuous PDC outcome. Chi-square tests used to assess statistical associations for the categorical PDC ≥ 80 outcome.

^a Preperiod = April 2012 to March 2013.

^b Postperiod = April 2013 to March 2014.

^c Difference = preperiod to postperiod.

^d Difference-in-difference = difference (intervention)–difference (control).

PDC = proportion of days covered.