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Table 1 Secondary, supportive and intermediate outcomes

From: The evaluation of enhanced feedback interventions to reduce unnecessary blood transfusions (AFFINITIE): protocol for two linked cluster randomised factorial controlled trials

Surgical audit
Secondary outcomes • Total volume of allogeneic red cells transfused (units at trust-level; units at patient-level);
• Total number of incidents reported to SHOT (count at trust-level);
• Number of definitely, probably or possibly preventable incidents reported to SHOT within clinical specialties targeted by the audit (count at trust-level)
Supportive outcomes • Pre-operative transfusion (unnecessary/necessary)
• Post-operative transfusion (unnecessary/necessary)
• Individual NCA audit standard met
• Total volume of red cells issued (units at trust-level)
• Total volume of red cells wasted (units at trust-level)
Intermediate outcomes (mediators) Include:
• Whether the planned surgery date equals the actual surgery date
• Volume of post-operative cell salvage transfused
• Hb level
• Length of post-operative hospital stay
Trust process level data • Intervention fidelity
• Organizational structures and resources
• Tier of data collectors
Haematology audit
Secondary outcomes • Total volume of allogeneic red cells transfused (units at trust-level; units at patient-level);
• Total volume of platelets transfused (units at patient-level);
• Total number of incidents reported to SHOT (count at trust-level);
• Number of definitely, probably or possibly preventable incidents reported to SHOT within clinical specialties targeted by the audit (count at trust-level)
Supportive outcomes • Red cell transfusion alone (unnecessary/necessary)
• Platelet transfusion alone (unnecessary/necessary)
• Individual NCA audit standard met
• Total volume of red cells issued (units at trust-level)
• Total volume of red cells wasted (units at trust-level)
• Total volume of platelets issued (units at trust-level)
• Total volume of platelets wasted (units at trust-level)
Intermediate outcomes (mediators) Include:
• Whether the Hb level was checked after each unit was transfused
• Whether the platelet count was measured after each unit was transfused
Trust process level data • Intervention fidelity
• Organizational structures and resources
• Tier of data collectors