As noted in the detailed version of the Preamble, an independent evidence review committee was commis- sioned to perform a formal systematic review of critical clinical questions related to cholesterol (Table 1), the Table 1. ERC Questions Question Section Number In adults 20 years of age with clinical atherosclerotic disease (eg, CHD, peripheral artery disease, or CVD) or at high-risk of ASCVD, what are the magnitude of benefit (absolute reduction; NNT) in individual endpoints and composite ischemic events (eg, fatal cardiovascular event, nonfatal MI, nonfatal stroke, unstable angina/revascularization) and magnitude of harm (absolute increase; NNH) in terms of adverse events (eg, cancer, rhabdomyolysis, diabetes mellitus) derived from LDL-C lowering in large RCTs (>1000 participants and originally designed to last >12 months) with statin therapy plus a second lipid-modifying agent compared with statin alone? Clinical atherosclerotic cardiovascular disease (ASCVD) includes acute coronary syndrome (ACS), those with history of myocardial infarction (MI), stable or unstable angina or coronary or other arterial revascularization, stroke, transient ischemic attack (TIA), or peripheral artery disease (PAD) including aortic aneurysm, all of atherosclerotic origin. ASCVD indicates atherosclerotic cardiovascular disease; CHD, coronary heart disease; CVD, cardiovascular disease; ERC, Evidence Review Committee; LDL-C, low-density lipoprotein cholesterol; MI, myocardial infarction; NNH, number needed to harm; NNT number needed to treat; and RCT, randomized controlled trial. CLINICAL STATEMENTS AND GUIDELINES results of which were considered by the writing com- mittee for incorporation into the present guideline. Concurrent with this process, writing committee mem- bers evaluated study data relevant to the rest of the guideline. The findings of the evidence review commit- tee and the writing committee members were formally presented and discussed, and then recommendations were developed. The systematic review for the 2018 Cholesterol Clinical Practice GuidelinesS1.1-1 is published in conjunction with the present guideline, and includes its respective data supplements. 