Selection bias (biased allocation to interventions) due to inadequate generation of a randomised sequence

Selection bias (biased allocation to interventions) due to inadequate concealment of allocations prior to assignment

Performance bias due to knowledge of the allocated interventions by participants and personnel during the study

Detection bias due to knowledge of the allocated interventions by outcome assessors

Attrition bias due to amount, nature or handling of incomplete outcome data

Reporting bias due to selective outcome reporting

Bias due to problems not covered elsewhere in the table