Table 1

Proposed multilevel factors for the domains of inner setting and individual characteristics

Domains	Levels	Variables	Data sources
Inner setting	Clinic	Administrative mode of PROMs (eg, paper, tablet) Average outpatient volume per week Average years of training in providers Average years in practice in providers Average PROMs collection per week Clinical level (community or academic) Early adoption (PROMs programme launched from March 2014 to December 2016) History of PROMs programme Institute characteristics (eg, total employees)	EDW, MGB administrative data, direct contact
Individual characteristics	Provider	Average number of clinical patients per week Average PROMs collection per week Providers’ characteristics (eg, sex) Years of training Years in practice	EDW, MGB administrative data, Harvard catalyst, CMS, NPPES, direct contact
Individual characteristics	Patient	Age Cancer diagnosis Cancer stage at PROM submission Comorbidity Education Employment status Ethnicity Financial insurance Language Race Sex	EDW

CMS, Center for Medicare & Medicaid Services; EDW, enterprise data warehouse; MGB, Mass General Brigham; NPPES, National Plan & Provider Enumeration System; PROMs, patient-reported outcome measures.