Search the entire Understanding Patient Data site Search Reducing nationwide variation in stroke prevention and treatment Equal access to bowel cancer treatments in Yorkshire Monitoring joint replacement surgery Comparing the uptake of emergency operations for heart attack across England Using data to plan services for people living with and beyond cancer The impact of air pollution on health Using pan-European data to understand how air pollution affects health Investigating trends in diabetes across ethnic groups Understanding why diabetes rates vary between ethnic groups Improving treatments for COPD Real-time monitoring of a new treatment for COPD in Salford