Firmly grounded in medical research, this book emphasizes the interpretation of the results of statistical calculations. The fundamental concepts of study design and statistical inference are explained by illustration and example and, for those who wish to go further, the mathematical background is also described. Much of the data is from the author's own research and statistical consultation. Seventy-five multiple-choice questions and 15 exercises in study design and data analysis are included, with fully explained solutions. This is a highly useful book for students and doctors who wish to learn the practical application of statistical methods.