Table 2 Types of variables to consider when evaluating the risk of design errors ('context errors') and hence external validity of evidence
From: Evidence at a glance: error matrix approach for overviewing available evidence
1 | Outcome measures |
2 | Participants |
3 | Experimental intervention |
4 | Control intervention |
5 | Clinical centres or settings including patients |
6 | Goal - explanatory or pragmatic |
7 | Trial structure - parallel group, crossover, etc |
8 | Objective - superiority, equivalence, non-inferiority |
9 | Unit of analysis |