PDQ Epidemiology is an exceptionally clear and highly irreverent review of the important concepts of medical statistics and their impact on public health policy. As the authors note in their preface: "...the role of epidemiology these days fills the gaping chasm between the scientific wisdom of the wet laboratory and the clinical wisdom of the ward." By translating the terminology of epidemiology into easy to understand language, the common sense of the methods emerges and makes sense to student