Welcome to the ITHIM repository.

The Integrated Transport and Health Impact Model (ITHIM) has been developed to estimate how changes to transport systems would impact on population health.

The tool has been used both in policy and in academic research.

ITHIM currently exists in different versions (mainly Excel and Analytica) and this repository is part of an attempt to move to a new integrated code base.

ITHIM was originally developed by Dr James Woodcock, University of Cambridge, UK. Much of the development of the USA version has been led by Dr Neil Maizlish. Other notable ITHIM policy projects have occurred in Oregon (Dr Eric Main) and Nashville (Dr Jeff Whitfield). Versions in development include those by Dr Alex Karner, and a substantial update being planned for England as part of the METAHIT project (led by Dr James Woodcock).

It is intended that ITHIM is developed as collaborative open source project to which multiple people and institutions participate. Our hope is that while people will want different versions for their own context much of the code can be developed in common and that the common code base will help with testing the implications of using different methods or data.

Major high level issues that we are working on (and invite collaboration on) are

1. Working with sparse data/ imputation of missing data/ modelling at different spatial scales
2. Better calibration of surveillance and etiological data on phyiscal activity, air pollution, and noise pollution
3. Value of Information analysis
4. Injury risk: including safety in numbers and issues relating to (1)
5. Use of novel and big data sets to estimate population exposures and travel patterns
6. Methods for including noise pollution
7. Comparative modelling methods with calibration factors, e.g. multistate life table vs comparative risk assessment
8. Data driven scenario development as in www.pct.bike