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This study builds on an existing framework to suggest additional metrics to measure the impact of Tommy's work. An overall logic model is identified to infer and justify appropriate indicators and their respective data sources with which to measure Tommy's impact in stillbirth, preterm birth and miscarriages.

Important insights that informed the development of these metrics included:

• The rates of stillbirth, preterm birth and miscarriage are interrelated.
• There is no unified data source across England, Wales and Scotland for measuring the ultimate impact in terms of reducing the number of babies who die during pregnancy or birth.
• There are significant gaps and variations in the data measured in England, Wales and Scotland.
• Looking at more common intermediate outcomes can be helpful in terms of understanding pregnancy and maternity-related outcomes.