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At a minimum, the IPD requested for each trial would typically include variables that:

 ‘Identify’ participants, e.g.De‐identified participant ID (Section 4.4.1), centre ID

 Describe the participant population, facilitate data checking and allow analyses by participant characteristics, e.g.Age, sex, demographic variables, disease or condition characteristics and key prognostic factors

 Describe the intervention, e.g.Date of randomisationIntervention allocationIf appropriate, the interventions participants received and the dates of administration

 Record all outcomes of interest and relevant to the objectives, e.g.Survival, toxicity, pre‐eclampsia, healing, hospital stay, last follow‐up date

 Describe whether participants were excluded from the primary trial analysis and reasons, e.g.Ineligible, protocol violation, missing outcome data, withdrawal, ‘early’ outcome

Source: Jayne Tierney and Lesley Stewart.