Depression in old age

[1]  S. Ceniceros Alzheimer's disease and depression. , 1998, Psychiatric services.

[2]  D. Lester,et al.  Suicide in an international perspective. , 1997, Suicide & life-threatening behavior.

[3]  J. O'Brien,et al.  Why do the depressed elderly die? , 1994 .

[4]  C. Katona Depression in Old Age , 1994 .

[5]  B. Draper Suicidal behaviour in the elderly , 1994 .

[6]  C. Hock,et al.  [Prognosis of depression in the elderly]. , 1994, Versicherungsmedizin.

[7]  D. Blazer Is Depression More Frequent in Late Life?: An Honest Look at the Evidence. , 1994, The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry.

[8]  B. Winblad,et al.  Outcome of depression in demented and non‐demented elderly: Observations from a three‐year follow‐up in a community‐based study , 1994 .

[9]  E. Caine,et al.  Reconsidering Depression in the Elderly. , 1993, The American journal of geriatric psychiatry : official journal of the American Association for Geriatric Psychiatry.

[10]  G. Alexopoulos,et al.  The course of geriatric depression with "reversible dementia": a controlled study. , 1993, The American journal of psychiatry.

[11]  M. Dewey,et al.  The prevalence of dementia, depression and neurosis in later life: the Liverpool MRC-ALPHA Study. , 1993, International journal of epidemiology.

[12]  M. Leon,et al.  Hippocampal atrophy in normal aging. An association with recent memory impairment. , 1993, Archives of neurology.

[13]  T. Erkinjuntti,et al.  White matter changes in healthy elderly persons correlate with attention and speed of mental processing. , 1993, Archives of neurology.

[14]  A. Mackinnon,et al.  The prevalence of depressive disorders and the distribution of depressive symptoms in later life: a survey using Draft ICD-10 and DSM-III-R , 1993, Psychological Medicine.

[15]  J. Copeland,et al.  Cross‐cultural comparison of depression and depressive symptoms in older people , 1993, Acta psychiatrica Scandinavica.

[16]  G. Stoppe,et al.  Die frühe diagnostische Differenzierung primär dementer von primär depressiven Syndromen im Alter - ein Beitrag zur Pseudodemenzdiskussion , 1993 .

[17]  A. Steiger,et al.  Studies of nocturnal penile tumescence and sleep electroencephalogram in patients with major depression and in normal controls , 1993, Acta psychiatrica Scandinavica.

[18]  I. Skoog The prevalence of psychotic, depressive and anxiety syndromes in demented and non‐demented 85‐year‐olds , 1993 .

[19]  P. Lewinsohn,et al.  Age-cohort changes in the lifetime occurrence of depression and other mental disorders. , 1993, Journal of abnormal psychology.

[20]  B. Mulsant,et al.  Update on the dementia spectrum of depression , 1993, American Journal of Psychiatry.

[21]  R. Baldwin Late life depression and structural brain changes: A review of recent magnetic resonance imaging research , 1993 .

[22]  G. Hinrichsen Recovery and relapse from major depressive disorder in the elderly. , 1992, The American journal of psychiatry.

[23]  R. Schulz,et al.  Pain, activity restriction, and symptoms of depression among community-residing elderly adults. , 1992, Journal of gerontology.

[24]  J. Copeland,et al.  Risk factors for depression in elderly people: a prospective study , 1992, Acta psychiatrica Scandinavica.

[25]  C. Ross,et al.  Age and depression. , 1992, Journal of health and social behavior.

[26]  J. Copeland,et al.  Alzheimer's Disease, Other Dementias, Depression and Pseudo-dementia: Prevalence, Incidence and Three-Year Outcome in Liverpool , 1992, British Journal of Psychiatry.

[27]  M. Folstein,et al.  The epidemiology of psychiatrist-ascertained depression and DSM-III depressive disorders Results from the Eastern Baltimore Mental Health Survey Clinical , 1992, Psychological Medicine.

[28]  T. Heeren,et al.  The general population prevalence of non-organic psychiatric disorders in subjects aged 85 years and over , 1992, Psychological Medicine.

[29]  G. Klerman,et al.  Mania in late life: focus on age at onset. , 1992, The American journal of psychiatry.

[30]  G. Simon,et al.  Reevaluation of secular trends in depression rates. , 1992, American journal of epidemiology.

[31]  M. Bruce,et al.  Psychiatric Status among the Homebound Elderly: An Epidemiologic Perspective , 1992, Journal of the American Geriatrics Society.

[32]  R. Ramsay,et al.  Depression and physical illness in the elderly. , 1992, Clinics in geriatric medicine.

[33]  G. Alexopoulos,et al.  Outcomes of geriatric depression. , 1992, Clinics in geriatric medicine.

[34]  D. Blazer,et al.  Epidemiology of geriatric affective disorders. , 1992, Clinics in geriatric medicine.

[35]  J. Teresi,et al.  Depression in nursing home residents. , 1992, Clinics in geriatric medicine.

[36]  R. Bland Psychiatric Disorders in America: The Epidemiologic Catchment Area Study , 1992 .

[37]  L. George,et al.  Age and impaired subjective support. Predictors of depressive symptoms at one-year follow-up. , 1992, The Journal of nervous and mental disease.

[38]  Emery Vo,et al.  Update on the dementia spectrum of depression. , 1992, The American journal of psychiatry.

[39]  G. Kennedy,et al.  Depressive symptoms and mortality in elderly persons. , 1992, Journal of gerontology.

[40]  I. Paquette,et al.  De novo mania among elderly people , 1991, Acta psychiatrica Scandinavica.

[41]  F. Houston Mania in the Elderly , 1991, Canadian journal of psychiatry. Revue canadienne de psychiatrie.

[42]  I. Hickie,et al.  Age and depression. , 1991, Journal of affective disorders.

[43]  L. George,et al.  The association of age and depression among the elderly: an epidemiologic exploration. , 1991, Journal of gerontology.

[44]  M. Carta,et al.  Prevalence of mental disorders in Sardinia: a community study in an inland mining district , 1991, Psychological Medicine.

[45]  R. Sattin,et al.  Suicides among older United States residents: epidemiologic characteristics and trends. , 1991, American journal of public health.

[46]  B. Kennedy,et al.  Classification of Koro , 1991 .

[47]  R. Robinson,et al.  Are depressive symptoms nonspecific in patients with acute stroke? , 1991, The American journal of psychiatry.

[48]  H. Cohen,et al.  Major Depressive Disorder in Hospitalized Medically Ill Patients: An Examination of Young and Elderly Male Veterans , 1991, Journal of the American Geriatrics Society.

[49]  A. Henderson,et al.  The prevalence of depression among Australian nursing home residents: results using draft ICD-10 and DSM-III-R criteria , 1991, Psychological Medicine.

[50]  D. Blazer Clinical features in depression in old age: a case for minor depression , 1991 .

[51]  P. Rabins,et al.  Mania in the Elderly: A 5–7 Year Follow‐Up , 1991, Journal of the American Geriatrics Society.

[52]  P. Lewinsohn,et al.  Age and depression: unique and shared effects. , 1991, Psychology and aging.

[53]  G. Kennedy,et al.  Persistence and remission of depressive symptoms in late life. , 1991, The American journal of psychiatry.

[54]  L. George,et al.  Depression, disability days, and days lost from work in a prospective epidemiologic survey. , 1990, JAMA.

[55]  P V Cooper,et al.  Discourse production and normal aging: performance on oral picture description tasks. , 1990, Journal of gerontology.

[56]  G. Herbison,et al.  The mental health of elderly women in the community , 1990 .

[57]  D. Regier,et al.  Age at onset of selected mental disorders in five community populations. , 1990, Archives of general psychiatry.

[58]  M. Weissman,et al.  Factors associated with 1-year outcome of major depression in the community. , 1990, Archives of general psychiatry.

[59]  R. Turner,et al.  Major Depression and Depressive Symptomatology among the Physically Disabled: Assessing the Role of Chronic Stress , 1990, The Journal of nervous and mental disease.

[60]  E. Caine,et al.  Completed Suicide at Age 50 and Over , 1990, Journal of the American Geriatrics Society.

[61]  D. Ames Depression among Elderly Residents of Local-Authority Residential Homes , 1990, British Journal of Psychiatry.

[62]  T. Oxman,et al.  Symptomatology of late-life minor depression among primary care patients. , 1990, Psychosomatics.

[63]  V. Lehtinen,et al.  Prevalence of mental disorders among adults in Finland: basic results from the Mini Finland Health Survey , 1990, Acta psychiatrica Scandinavica.

[64]  Cynthia Thomas,et al.  The emergence of depressive symptoms in late life: The importance of declining health and increasing disability , 1990, Journal of Community Health.

[65]  K. Kafetz,et al.  Dementia, depression and physical disability in a London borough: a survey of elderly people in and out of residential care and implications for future developments. , 1990, Age and ageing.

[66]  D. O'Connor,et al.  Coexisting Depression and Dementia in a Community Survey of the Elderly , 1990, International Psychogeriatrics.

[67]  G. Livingston,et al.  The Gospel Oak Study: prevalence rates of dementia, depression and activity limitation among elderly residents in Inner London , 1990, Psychological Medicine.

[68]  K. Neet,et al.  Alzheimer's Disease and Related Disorders , 1990, Neurology.

[69]  R. Diekstra Suicide and the attempted suicide: An interntional perspective , 1989, Acta psychiatrica Scandinavica. Supplementum.

[70]  J. Lindesay,et al.  The Guy's/Age Concern Survey , 1989, British Journal of Psychiatry.

[71]  C. Mazure,et al.  Depression in late life: age of onset as marker of a subtype. , 1989, Journal of affective disorders.

[72]  H. Akiskal,et al.  Depression Before and After Age 65 , 1989, British Journal of Psychiatry.

[73]  D. Kleinbaum,et al.  The association between depressive symptoms and mortality among older participants in the Epidemiologic Catchment Area-Piedmont Health Survey. , 1989, Journal of gerontology.

[74]  P. Leaf,et al.  Psychiatric disorders and 15-month mortality in a community sample of older adults. , 1989, American journal of public health.

[75]  V. A. Kral,et al.  Long-Term Follow-up of Depressive Pseudodementia of the Aged * , 1989, Canadian journal of psychiatry. Revue canadienne de psychiatrie.

[76]  D. Jeste,et al.  Overview of depression and psychosis in Alzheimer's disease. , 1989, The American journal of psychiatry.

[77]  I. Katz,et al.  Clinical Features of Depression in the Nursing Home , 1989, International Psychogeriatrics.

[78]  W. Eaton,et al.  The incidence of specific DIS/DSM‐III mental disorders: data from the NIMH Epidemiologic Catchment Area Program , 1989, Acta psychiatrica Scandinavica.

[79]  W. Ettinger,et al.  Instruments for Screening for Depression and Dementia in a Long‐Term Care Facility , 1989, Journal of the American Geriatrics Society.

[80]  M. Raskind,et al.  The neurobiology of aging: Does it predispose to depression? , 1988, Neurobiology of Aging.

[81]  J. Copeland,et al.  Organization of depressive symptoms in the elderly population: hierarchical patterns and Guttman scales. , 1988, Psychology and aging.

[82]  M. Woodbury,et al.  Depressive symptoms and depressive diagnoses in a community population. Use of a new procedure for analysis of psychiatric classification. , 1988, Archives of general psychiatry.

[83]  D S Rae,et al.  One-month prevalence of mental disorders in the United States. Based on five Epidemiologic Catchment Area sites. , 1988, Archives of general psychiatry.

[84]  B. Greenwald,et al.  Age at onset in geriatric depression: relationship to clinical variables. , 1988, Journal of affective disorders.

[85]  B. Gurland,et al.  Depression and disability in the elderly: Reciprocal relations and changes with age , 1988 .

[86]  C. Coffey,et al.  Leukoencephalopathy in elderly depressed patients referred for ECT , 1988, Biological Psychiatry.

[87]  M. Dewey,et al.  The relationship between mortality and mental disorder: Evidence from the Liverpool longitudinal study , 1988 .

[88]  C. Nemeroff,et al.  Leukoencephalopathy in patients diagnosed as major depressive , 1988, Biological Psychiatry.

[89]  R. Turner,et al.  Physical disability and depression: a longitudinal analysis. , 1988, Journal of health and social behavior.

[90]  R. Bland,et al.  PERIOD PREVALENCE OF PSYCHIATRIC DISORDERS IN EDMONTON , 1988, Acta psychiatrica Scandinavica. Supplementum.

[91]  R. Bland,et al.  AGE OF ONSET OF PSYCHIATRIC DISORDERS , 1988, Acta psychiatrica Scandinavica. Supplementum.

[92]  J. Copeland,et al.  The Geriatric Mental State (GMS) used in the community: replication studies of the computerized diagnosis AGECAT , 1988, Psychological Medicine.

[93]  J. Copeland,et al.  Is There More Dementia, Depression and Neurosis in New York? , 1987, British Journal of Psychiatry.

[94]  D. Blazer,et al.  Major Depression with Melancholia: A Comparison of Middle‐Aged and Elderly Adults , 1987, Journal of the American Geriatrics Society.

[95]  J. Copeland,et al.  The distribution of dementia, depression and neurosis in elderly men and women in an urban community: Assessed using the GMS–AGECAT package , 1987 .

[96]  J. Copeland,et al.  Range of Mental Illness Among the Elderly in the Community , 1987, British Journal of Psychiatry.

[97]  T. Revenson,et al.  Age differences in coping with chronic illness. , 1987, Psychology and aging.

[98]  P. Fell,et al.  Depression, Dementia and Disability in the Elderly , 1987, British Journal of Psychiatry.

[99]  Anthony F Jorm Sex and Age Differences in Depression: A Quantitative Synthesis of Published Research , 1987, The Australian and New Zealand journal of psychiatry.

[100]  D. Jolley,et al.  The Prognosis of Depression in Old Age , 1986, British Journal of Psychiatry.

[101]  Alyn K. Stanton,et al.  Age at first onset for nonbipolar depression. , 1986, Journal of abnormal psychology.

[102]  L. George,et al.  Psychosocial Risk Factors and Urban/Rural Differences in the Prevalence of Major Depression , 1986, British Journal of Psychiatry.

[103]  D H Freeman,et al.  Depressive symptoms in relation to physical health and functioning in the elderly. , 1986, American journal of epidemiology.

[104]  J. F. Phifer,et al.  Etiologic factors in the onset of depressive symptoms in older adults. , 1986, Journal of abnormal psychology.

[105]  P. Williams,et al.  Dementia and depression in italian geriatric institutions , 1986 .

[106]  D. Kay,et al.  Social support, dementia and depression among the elderly living in the Hobart community , 1986, Psychological Medicine.

[107]  Alyn K. Stanton,et al.  Relation of age at onset to duration of episode in unipolar depression. , 1986, Psychology and aging.

[108]  S. Borson,et al.  Depression and physical illness among elderly general medical clinic patients. , 1986, Journal of affective disorders.

[109]  J. Copeland,et al.  A computerized psychiatric diagnostic system and case nomenclature for elderly subjects: GMS and AGECAT , 1986, Psychological Medicine.

[110]  R. Lévy,et al.  Computed Tomography in the Elderly , 1986, British Journal of Psychiatry.

[111]  D. Kay,et al.  Dementia and depression among the elderly living in the Hobart community: the effect of the diagnostic criteria on the prevalence rates , 1985, Psychological Medicine.

[112]  M. Reding,et al.  Depression in patients referred to a dementia clinic. A three-year prospective study. , 1985, Archives of neurology.

[113]  J. Oliver,et al.  Affective disorders and depression as measured by the Diagnostic Interview Schedule and the Beck Depression Inventory in an unselected adult population. , 1985, Journal of clinical psychology.

[114]  B. Mahendra Depression and dementia: the multi-faceted relationship , 1985, Psychological Medicine.

[115]  M M Weissman,et al.  Six-month prevalence of psychiatric disorders in three communities 1980 to 1982. , 1984, Archives of general psychiatry.

[116]  D. C. Olivier,et al.  Stability of prevalence. Depression and anxiety disorders. , 1984, Archives of general psychiatry.

[117]  P. Rabins,et al.  Criteria for Diagnosing Reversible Dementia Caused by Depression: Validation by 2-year Follow-up , 1984, British Journal of Psychiatry.

[118]  J. Holmes Listening Perspectives in Psychotherapy. By Lawrence E. Hedges New York: Jason Aronson. 1983. Pp 329. $25. , 1984, British Journal of Psychiatry.

[119]  K. Enzell Mortality among persons with depressive symptoms and among responders and non‐responders in a health check‐up , 1984, Acta psychiatrica Scandinavica.

[120]  J. Brown Possible effects of rapid cycling in "double depression". , 1984, The American journal of psychiatry.

[121]  E. Uhlenhuth,et al.  Symptom checklist syndromes in the general population. Correlations with psychotherapeutic drug use. , 1983, Archives of general psychiatry.

[122]  Boris OGUIBENINE,et al.  [Psychiatric disease in an elderly population. An epidemiologic field study in Mannheim]. , 1983, Der Nervenarzt.

[123]  M. Cole Age, Age of Onset and Course of Primary Depressive Illness in the Elderly* , 1983, Canadian journal of psychiatry. Revue canadienne de psychiatrie.

[124]  J. Ouslander Physical Illness and Depression in the Elderly , 1982, Journal of the American Geriatrics Society.

[125]  D. Blazer,et al.  The Epidemiology of Late Life Depression , 1982, Journal of the American Geriatrics Society.

[126]  P W Lavori,et al.  Relapse in major depressive disorder: analysis with the life table. , 1982, Archives of general psychiatry.

[127]  Price Tr,et al.  Severe depressive pseudodementia with and without dementia. , 1982 .

[128]  L G Kessler,et al.  Rates of symptoms of depression in a national sample. , 1981, American journal of epidemiology.

[129]  G. Persson Five‐year mortality in a 70‐year‐old urban population in relation to psychiatric diagnosis, personality, sexuality and early parental death , 1981, Acta psychiatrica Scandinavica.

[130]  M. Weissman,et al.  Epidemiology of affective disorders. A reexamination and future directions. , 1981, Archives of general psychiatry.

[131]  R R Frerichs,et al.  Prevalence of depression in Los Angeles County. , 1981, American journal of epidemiology.

[132]  P. Costa,et al.  Somatic complaints in males as a function of age and neuroticism: A longitudinal analysis , 1980, Journal of Behavioral Medicine.

[133]  M. Weissman,et al.  Psychiatric disorders in a U.S. community THE APPLICATION OF RESEARCH DIAGNOSTIC CRITERIA TO A RESURVEYED COMMUNITY SAMPLE , 1980, Acta psychiatrica Scandinavica.

[134]  D. Blazer,et al.  Epidemiology of dysphoria and depression in an elderly population. , 1980, The American journal of psychiatry.

[135]  R Jenkins,et al.  A cross-national comparison of the institutionalized elderly in the cities of New York and London , 1979, Psychological Medicine.

[136]  C. Holzer,et al.  Mortality and community mental health. The Alachua County, Florida, mortality study. , 1977, Archives of general psychiatry.

[137]  L. Radloff The CES-D Scale , 1977 .

[138]  G W Comstock,et al.  Symptoms of depression in two communities , 1977, Psychological Medicine.

[139]  L. Jarvik Aging and depression: some unanswered questions. , 1976, Journal of gerontology.

[140]  B. Gurland The comparative frequency of depression in various adult age groups. , 1976, Journal of gerontology.

[141]  D. Kay PRESENT STATE EXAMINATION , 1975, British Journal of Psychiatry.

[142]  R. Lipman,et al.  Symptom intensity and life stress in the city. , 1974, Archives of general psychiatry.

[143]  P. Grof,et al.  The course of monopolar depression and bipolar psychoses. , 1973, Psychiatria, neurologia, neurochirurgia.

[144]  L. H. Seiler The 22-item scale used in field studies of mental illness: a question of method, a question of substance, and a question of theory. , 1973, Journal of health and social behavior.

[145]  F. Post The Management and Nature of Depressive Illnesses in Late Life: A Follow-Through Study , 1972, British Journal of Psychiatry.

[146]  C. Gaitz,et al.  Age and the measurement of mental health. , 1972, Journal of health and social behavior.

[147]  T. A. Kerr,et al.  The Relationship between Premature Death and Affective Disorders , 1969, British Journal of Psychiatry.

[148]  D. Kay,et al.  Physical disability and mental health in old age. A follow-up of a random sample of elderly people seen at home. , 1966, Journal of psychosomatic research.

[149]  E. Hare,et al.  Mental Health on a New Housing Estate , 1965, Mental Health.

[150]  G. Winokur,et al.  DEPRESSION AMONG MEDICALLY ILL PATIENTS. , 1965, Diseases of the nervous system.

[151]  D. Robertson-Ritchie,et al.  The encyclopaedia of sexual behaviour , 1965 .

[152]  W. Mink The significance of affective symptoms in old age , 1963 .

[153]  M. Roth,et al.  Affective disorders arising in the senium. I. Their association with organic cerebral degeneration. , 1955, The Journal of mental science.

[154]  J. Dartigues,et al.  The co-occurrence of depressive symptoms and cognitive impairment in a french community: Are there gender differences? , 2005, European Archives of Psychiatry and Clinical Neuroscience.

[155]  A. A.,et al.  Involutional melancholia , 2005, The Psychiatric Quarterly.

[156]  P. Cross,et al.  Institutional care of the elderly: a comparison of the cities of New York, London and Mannheim , 2004, Social psychiatry.

[157]  R. Kessler,et al.  Lifetime and 12-month prevalence of DSM-III-R psychiatric disorders in the United States. Results from the National Comorbidity Survey. , 1994, Archives of general psychiatry.

[158]  Charles G. Costello Symptoms of depression , 1993 .

[159]  C. Reynolds,et al.  The Biology of Late-Life Depression , 1993 .

[160]  I. Skoog Mental disorders in the elderly : a population study in 85-year-olds , 1993 .

[161]  R. Frierson Suicide attempts by the old and the very old. , 1991, Archives of internal medicine.

[162]  R. Philpott Affective disorder and physical illness in old age. , 1990, International clinical psychopharmacology.

[163]  L. Palinkas,et al.  Chronic illness and depressive symptoms in the elderly: a population-based study. , 1990, Journal of clinical epidemiology.

[164]  J. Copeland,et al.  Dementia and depression in elderly persons: Agecat compared with dsm III and pervasive illness , 1990 .

[165]  I. Katz,et al.  Depression among institutionalized aged: assessment and prevalence estimation. , 1989, Journal of gerontology.

[166]  D. Blazer The epidemiology of depression in late life. , 1989, Journal of geriatric psychiatry.

[167]  B. Lawlor,et al.  Depressive syndromes in the elderly: special concerns. , 1988, Psychopharmacology bulletin.

[168]  J. Angst Clinical Course of Affective Disorders , 1988 .

[169]  V Lehtinen,et al.  [The epidemiology of schizophrenia]. , 1987, Nordisk medicin.

[170]  J. Snowdon,et al.  A study of depression in nursing homes. , 1986, Journal of psychiatric research.

[171]  M. Folstein,et al.  Prevalence of mental illness in a community nursing home. , 1986, The American journal of psychiatry.

[172]  S. Guze,et al.  Mortality in a follow-up of 500 psychiatric outpatients. II. Cause-specific mortality. , 1985, Archives of general psychiatry.

[173]  M. Tsuang,et al.  Mortality studies in psychiatry. Should they stop or proceed? , 1985, Archives of general psychiatry.

[174]  S. Guze,et al.  Mortality in a follow-up of 500 psychiatric outpatients. I. Total mortality. , 1985, Archives of general psychiatry.

[175]  D. Black,et al.  The Iowa record-linkage study. III. Excess mortality among patients with 'functional' disorders. , 1985, Archives of General Psychiatry.

[176]  J. Sweeney,et al.  Involutional melancholia revisited. , 1984, The American journal of psychiatry.

[177]  C. Wächtler,et al.  [Suicidal behavior of the elderly]. , 1984, Psychiatrische Praxis.

[178]  K. Warner Schaie,et al.  Longitudinal studies of adult psychological development , 1983 .

[179]  D. Blazer,et al.  Depressive symptoms: Impact and problems in long term care facilities. , 1982 .

[180]  R. Hirschfeld,et al.  Epidemiology of affective disorders. , 1982, Archives of general psychiatry.

[181]  D. Klein Clinical and biological aspects of depression in the elderly. , 1980, Proceedings of the annual meeting of the American Psychopathological Association.

[182]  J. Schwab,et al.  Mortality and community mental health. , 1977 .

[183]  J. Ionescu Die Schizophrenen Geistesstörungen , 1973 .

[184]  W. Zung A SELF-RATING DEPRESSION SCALE. , 1965, Archives of general psychiatry.

[185]  M. Roth,et al.  Affective disorders arising in the senium. II. Physical disability as an aetiological factor. , 1956, The Journal of mental science.