What is the fine-grained topic of the following text: Using population per value adjusted acre as a measure of population pressure, our results indicate that on the eve of the Great Famine of 1846–50, population pressure was positively associated with both illiteracy rates and the prevalence of poor quality housing. Only return the topic.
Impact of population pressure on illiteracy rates and poor housing quality before the Great Famine of 1846-50.