Sites will configure their EHR systems so that alerts will not be triggered for providers in the control arm if the patient does not have the condition on her/his problem list.

Sites will configure their EHR systems so that alerts for these conditions will be triggered for providers in the intervention arm if the patient does not have the condition on her/his problem list. Each alert will be actionable and allow the provider to add the problem to her or his patient's problem list with a single click. The provider will also be able to override the rule of the patient does not have the condition (in which case the alert will not be displayed again unless new information that would trigger the alert is added to the patient's record), or defer the alert until later.

Sites will configure their EHR systems so that alerts for these conditions will be triggered for providers in the intervention arm if the patient does not have the condition on her/his problem list. each alert will be actionable and allow the provider to add the problem to her or his patient's problem list with a single click. The provider will also be able to override the rule of the patient does not have the condition (in which case the alert will not be displayed again unless new information that would trigger the alert is added to the patient's record), or defer the alert until later.

Acceptance of the alerts:

This first endpoint is descriptive: the acceptance rate for the alerts presented to providers. This will be calculated by taking the total number of acceptances for each alert and dividing it by the total number or unique presentations of the alert. We will conduct a stratified analysis to look at differences in acceptance rates by institution, specialty, disease and provider demographic characteristics, and will report the results in tabular form.

Effect on the rate of problem list completion:

In this endpoint, we will compare the number of study-related problems added to patient problems lists in the electronic health record in the intervention and control groups.

Effect on quality of care:

Because a key goal of our study is improving clinical outcomes, we have selected four outcome measures to evaluate from NCQA's Healthcare Effectiveness Data and Information Set (HEDIS) 2013 measure set: LDL control in patients with a history of myocardial infarction, LDL control in patients with coronary artery disease, blood pressure control in patients with coronary artery disease and blood pressure control in patients with hypertension. The details for the numerator and denominator for each measure are given in the HEDIS manuals, and our study team will employ NCQA's procedures for calculation of each measure, with modifications as needed given the clinical nature of our dataset.

Improvements for process measures To complete the clinical endpoints in the third outcome, we will also evaluate process measures, specifically frequency of LDL testing, prescription of antihyperlipidemic agents, prescription of aspirin or other antiplatelet agents and prescription of antihypertensive agents. We will analyze the results using logistic regression with fixed effects for intervention group (versus control) and site and estimation of the regression parameters with generalized estimating equations (GEE), accounting for clustering between the patients in the same physician as well as patients with different physicians in the same matched pair. We will build separate regression models for each quality measure, and also conduct a pooled analysis with additional effects for quality measure and availability of CDS for the associated measure at the site, in order to estimate the extent to which IQ-MAPLE's effect on quality is mediated by CDS.