Table 1 Summary of inclusion and exclusion criteria

Participants

Adult patients with heart failure regardless of glucose metabolic state

Patients with acute coronary syndrome or cardiovascular revascularization less than 3 months

Exposure

Reporting HbA1c as continuous and/or categorical variables

Other

Comparator

Various categorical HbA1c levels

NA

Outcomes

All-cause mortality, cardiovascular death and heart failure readmission

NA

Study design

Prospective and retrospective cohort

Case-control, cross-sectional, randomized controlled trials, case report, case series, and any other non-relevant studies