1Cooper, SA, Smiley, E, Morrison, J, Williamson, A, Allan, L. Mental ill-health in adults with intellectual disabilities: prevalence and associated factors. Br J Psychiatry 2007; 190: 27–35.
2Emerson, E, Hatton, C. Mental health of children and adolescents with intellectual disabilities in Britain. Br J Psychiatry 2007; 191: 493–9.
3Cooper, SA, Smiley, E, Morrison, J, Allan, L, Williamson, A, Finlayson, J, et al. Psychosis and adults with intellectual disabilities. Prevalence, incidence, and related factors. Soc Psychiatry Psychiatr Epidemiol 2007; 42(7): 530–6.
4Deb, S, Thomas, M, Bright, C. Mental disorder in adults with intellectual disability. 2: the rate of behaviour disorders among a community-based population aged between 16 and 64 years. J Intellect Disabil Res 2001; 45(Pt 6): 506–14.
5Turner, TH. Schizophrenia and mental handicap: an historical review, with implications for further research. Psychol Med 1989; 19(2): 301–14.
6Morgan, VA, Leonard, H, Bourke, J, Jablensky, A. Intellectual disability co-occurring with schizophrenia and other psychiatric illness: population-based study. Br J Psychiatry 2008; 193(5): 364–72.
7Hassiotis, A, Noor, M, Bebbington, P, Afia, A, Wieland, J, Qassem, T. Borderline intellectual functioning and psychosis: Adult Psychiatric Morbidity Survey evidence. Br J Psychiatry 2017; 211(1): 50–1.
8Johnstone, EC, Ebmeier, KP, Miller, P, Owens, DG, Lawrie, SM. Predicting schizophrenia: findings from the Edinburgh High-Risk Study. Br J Psychiatry 2005; 186: 18–25.
9Yung, AR, Nelson, B. The ultra-high risk concept-a review. Can J Psychiatry 2013; 58(1): 5–12.
10Johnstone, EC, Owens, DG, Hoare, P, Gaur, S, Spencer, MD, Harris, J, et al. Schizotypal cognitions as a predictor of psychopathology in adolescents with mild intellectual impairment. Br J Psychiatry 2007; 191: 484–92.
11Spencer, MD, Moorhead, TW, McIntosh, AM, Stanfield, AC, Muir, WJ, Hoare, P, et al. Grey matter correlates of early psychotic symptoms in adolescents at enhanced risk of psychosis: a voxel-based study. Neuroimage 2007; 35(3): 1181–91.
12Stanfield, AC, Moorhead, TW, Harris, JM, Owens, DG, Lawrie, SM, Johnstone, EC. Increased right prefrontal cortical folding in adolescents at risk of schizophrenia for cognitive reasons. Biol Psychiatry 2008; 63(1): 80–5.
13Moorhead, TW, Stanfield, A, Spencer, M, Hall, J, McIntosh, A, Owens, DC, et al. Progressive temporal lobe grey matter loss in adolescents with schizotypal traits and mild intellectual impairment. Psychiatry Res 2009; 174(2): 105–9.
14Moorhead, TW, Stanfield, AC, McKechanie, AG, Dauvermann, MR, Johnstone, EC, Lawrie, SM, et al. Longitudinal gray matter change in young people who are at enhanced risk of schizophrenia due to intellectual impairment. Biol Psychiatry 2013; 73(10): 985–92.
15McKechanie, AG, Moorhead, TW, Stanfield, AC, Whalley, HC, Johnstone, EC, Lawrie, SM, et al. Negative symptoms and longitudinal grey matter tissue loss in adolescents at risk of psychosis: preliminary findings from a 6-year follow-up study. Br J Psychiatry 2016; 208(6): 565–70.
16Kendler, KS, Lieberman, JA, Walsh, D. The Structured Interview for Schizotypy (SIS): a preliminary report. Schizophr Bull 1989; 15(4): 559–71.
17Achenbach, TL. Integrative Guide for the 1991 CBCL/4-18, YSR, and TRF Profiles. University of Vermont Department of Psychiatry, 1991.
18Goldberg, DP, Cooper, B, Eastwood, MR, Kedward, HB, Shepherd, M. A standardized psychiatric interview for use in community surveys. Br J Prev Soc Med 1970; 24(1): 18–23.
19Kay, SR, Fiszbein, A, Opler, LA. The positive and negative syndrome scale (PANSS) for schizophrenia. Schizophr Bull 1987; 13(2): 261–76.
20Wechsler, D. Wechsler Adult Intelligence Scale (3rd edn). Psychological Corporation, 1992.
21Wechsler, D. Wechsler Intelligence Scale for Children (3rd edn). Psychological Corporation, 1999.
22Sussmann, JE, McIntosh, AM, Lawrie, SM, Johnstone, EC. Obstetric complications and mild to moderate intellectual disability. Br J Psychiatry 2009; 194(3): 224–8.
23Deb, S, Matthews, T, Holt, G, Bouras, N. Practice Guidelines for the Assessment and Diagnosis of Mental Health Problems in Adults with Intellectual Disability. Pavilion, 2001.
24Hubbard, L, Tansey, KE, Rai, D, Jones, P, Ripke, S, Chambert, KD, et al. Evidence of Common Genetic Overlap Between Schizophrenia and Cognition. Schizophr Bull 2016; 42(3): 832–42.
25Eaton, WW, Mortensen, PB, Thomsen, PH, Frydenberg, M. Obstetric complications and risk for severe psychopathology in childhood. J Autism Dev Disord 2001; 31(3): 279–85.
26Thapar, A, Collishaw, S, Pine, DS, Thapar, AK. Depression in adolescence. Lancet 2012; 379(9820): 1056–67.
27Essau, CA, Lewinsohn, PM, Olaya, B, Seeley, JR. Anxiety disorders in adolescents and psychosocial outcomes at age 30. J Affect Disord 2014; 163: 125–32.
28McGeown, HR, Johnstone, EC, McKirdy, J, Owens, DC, Stanfield, AC. Determinants of adult functional outcome in adolescents receiving special educational assistance. J Intellect Disabil Res 2012; 57(8): 766–33.