# Summary The English Teenage Pregnancy Strategy was launched in 1999. Observational data over the period shows a decline in rates of pregnancy amongst under-18-year-olds beginning in 1999 and continuing throughout and after the period of the strategy’s implementation. Using Natural Experimental approaches to evaluating the impact of the strategy could allow for greater confidence in the causal role of the strategy. This analysis will use Interrupted Time Series methods and Synthetic Control methods to compare England to non-exposed controls. Records of rates of conceptions, births and abortions from other UK countries and European and Anglophone High-Income Countries will be compared with England to test for differences in pregnancy rates attributable to exposure to the strategy. The output will be a proposed paper, conference presentations and posters, and public engagement activities. # Publications This analysis is now published as: Andrew J. Baxter, Ruth Dundas, Frank Popham and Peter Craig (2021), _How effective was England's teenage pregnancy strategy? A comparative analysis of high-income countries_, **Social Science & Medicine**, Volume 270. doi: [10.1016/j.socscimed.2021.113685](https://doi.org/10.1016/j.socscimed.2021.113685). Poster version online at https://osf.io/w6hv5/.