1 Jonathan M. Broadbent and W. Murray Thomson are with the Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand. Terrie E. Moffitt is with the Department of Psychology and Neuroscience at Duke University, Durham, NC and the Development, Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Kings College London, United Kingdom. Richie Poulton is with the Department of Psychology, University of Otago, Dunedin, New Zealand.