Gestational age on trajectories of social competence difficulties into adolescence Author’s names Dr Mariko Hosozawa, Dr Noriko Cable, Prof Yvonne Kelly, Prof Amanda Sacker Author address: Dr Mariko Hosozawa, Department of Epidemiology and Public Health, University College London, London, United Kingdom; Institute for Global Health Policy Research, Bureau of International Health Cooperation, National Center for Global Health and Medicine, Tokyo, Japan;Department of Paediatrics and Adolescent Medicine, Juntendo University, Tokyo, Japan; Dr Noriko Cable, ESRC International Centre for Lifecourse Studies in Society and Health, Department of Epidemiology and Public Health, University College London, London, UK Prof Yvonne Kelly, ESRC International Centre for Lifecourse Studies in Society and Health, Department of Epidemiology and Public Health, University College London, London, UK Prof Amanda Sacker, ESRC International Centre for Lifecourse Studies in Society and Health, Department of Epidemiology and Public Health, University College London, London, UK Corresponding author: Dr Mariko Hosozawa, Institute for Global Health Policy Research, Bureau of International Health Cooperation, National Center for Global Health and Medicine, Tokyo, Japan. [mhosozawa@it.ncgm.go.jp], +81-03-6228-0562 Word Count: 2556 /2500