Table 1.

RE-AIM dimensions and definitions for this study

RE-AIM Dimension	Definition for this Study
Reach	The absolute number, proportion, and representativeness of primary care patients who are willing to participate in lung cancer screening (LCS)a and reasons why or why not. Any discussion regarding the presence of absence of LCS being available to patients, which types of patients, and the factors affecting access to and use by patients
Effectiveness	The impact of getting screened for or having LCS on patient health and other outcomes, including quality of life and economic outcomes, as well as potential negative effects. Any discussion of how LCS impacted the patient or differences across different subgroups of patients
Adoption	The absolute number, proportion, and representativeness of a) settings and b) clinicians and staff who offer LCS to patients. Any discussion of the setting or people involved in making LCS available to patients, and the factors involved in making uptake of LCS provision to patients possible
Implementation	At the practice level, implementation refers to the clinicians and staff who provide LCS and their fidelity to the key elements to providing LCS and how they work. This includes a) completeness and consistency of delivery as intended, 2) the time and cost of delivering LCS, and 3) adaptations made to LCS and implementation strategies to make it happen. Any discussion of these factors including how patients experienced being offered (or not) LCS or its components
Maintenance	At the setting level, the extent to which LCS has become (or not) institutionalized or part of the routine organizational practices and policies. It also applies to the extent in which the patient receives regular (annual) LCS. Any discussion about continuing LCS as a regular practice and factors that influence that continuance

^aLCS includes the process of identifying patients’ smoking status and eligibility for LCS, interest in quitting, and offering assistance with quitting, as well as providing shared decision making about getting LCS, completing annual testing and coordinating referral and follow-up care