Table 2.

Segmented Regression Analysis: Changes in Diabetes Medication Prescribing in the Intervention Cohort of Detailed Prescribers

Prescribing metric	Parameter	Description	Parameter estimate	Standard error	t-statistic	P value
Proportion of patients with diabetes who received metformin	β0	Intercept: baseline level	0.3895	0.0025	157.36	<.0001
	β1	Preintervention slope: baseline trend	0.0043	0.0003	12.92	<.0001
	β2	Level change immediately after intervention	–0.0100	0.0033	–3.04	.0065
	β3	Change in trend over time after intervention	–0.0034	0.0005	–7.15	<.0001
Proportion of patients with diabetes and hypertension who received an ACE inhibitor or an ARB	β0	Intercept: baseline level	0.7084	0.0026	270.36	<.0001
	β1	Preintervention slope: baseline trend	0.0002	0.0004	0.68	.5074
	β2	Level change immediately after intervention	0.0155	0.0035	4.43	.0003
	β3	Change in trend over time after intervention	–0.0035	0.0005	–6.99	<.0001
Proportion of patients with diabetes who received a statin	β0	Intercept: baseline level	0.5447	0.0041	131.47	<.0001
	β1	Preintervention slope: baseline trend	0.0020	0.0006	3.58	.0019
	β2	Level change immediately after intervention	–0.0190	0.0055	–3.44	.0026
	β3	Change in trend over time after intervention	–0.0035	0.0008	–4.34	.0003
Proportion of sulfonylurea prescriptions for long-acting agents	β0	Intercept: baseline level	0.3283	0.0056	58.97	<.0001
	β1	Preintervention slope: baseline trend	–0.0076	0.0008	–10.03	<.0001
	β2	Level change immediately after intervention	0.0040	0.0074	0.53	.6003
	β3	Change in trend over time after intervention	0.0025	0.0011	2.31	.0314

ACE indicates angiotensin-converting enzyme; ARB, angiotensin receptor blocker.