Psychiatry Statistics – Flashcards
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Peak incidence age schizophrenia in males
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23 years
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Peak incidence age schizophrenia in females
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26 years
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Schizophrenia concordance rate for MZ twins
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46%
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Schizophrenia concordance rate for DZ twins
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15%
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Chance schizophrenia with both parents affected
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40%
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Chance schizophrenia with one parent affected
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15%
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Chance of schizophrenia with no family history
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1%
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Percentage that will have one episode of schizophrenia with no relapse
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20%
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Percentage of those with schizophrenia that are never free of symptoms
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30%
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Percentage of those with schizophrenia that improve but still need support
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25%
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Percentage of those with schizophrenia that commit suicide
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10%
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How long symptoms present for ICD-10 diagnosis schizophrenia
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1 month
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Life time prevalence of depressive symptoms
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10-20%
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Prevalence of major depressive illness
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5%
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Of those with major depression how many see a psychiatrist
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10%
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Of those with major depression how many are admitted to hospital
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0.1%
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How many with depression recover in one year
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50-60%
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How many experience chronic depression (more than 2 years)
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10-25%
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After one year what percentage of those with depression will have relapased
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25%
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After 10 years what percentage of those with depression will have relapsed
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75%
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What is the suicide rate in depression
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5-15%
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Average age of onset of bipolar
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21 years
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Following a manic episode what is the chance of another
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90%
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What percentage of those with bipolar have residual symptoms between episodes
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30%
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What is the suicide rate in bipolar
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10%
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Commonest age group for suicide
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15-44 years
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How long does hypomania need to be present for ICD-10 diagnosis
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4 days
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How long (or hospital admission) does mania need to be present for ICD-10 diagnosis
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1 week
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What percentage of those with mania will have first rank symptoms
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10%
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What is the suicide rate amongst alcoholics
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15%
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Therapeutic blood level for lithium
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0.4-1.3
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Level toxicity occurs at in lithium treatment
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1.5
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Level of emergency heamodialysis in lithium toxicity
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2.5
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How many sessions in a course of ECT
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4-12
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What is the chance of ECT being successful
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80%
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How long to treat a single episode of depression with ADs (once symptom free)
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6 months
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How long to treat recurrent depression with ADs (once symptom free)
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2 years
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Prevalence of personality disorder
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5-10%
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Prevalence of severe personality disorder
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2%
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Prevalence of personality disorder in prison
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60%
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Prevalence of anorexia nervosa
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0.6-1%
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Peak incidence age anorexia nervosa
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18 years
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At 10 years what percentage of those with anorexia have recovered
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50%
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At 10 years what percentage of those with anorexia have ongoing eating problems
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40%
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Mortality rate in anorexia nervosa
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10%
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Prevalence of bulimia nervosa
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1%
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What percentage of those with bulimia will have recovered at 10 years
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70%
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Mortality rate in bulimia nervosa
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1%
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Prevalence of anxiety disorder
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11%
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Prevalence of panic disorder
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1.7%
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Prevalence of OCD
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2.3%
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Prevalence of PTSD
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3.6%
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Prevalence of all phobias
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8%
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Prevalence of GAD
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2.8%
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How long had symptoms of anxiety for ICD-10 diagnosis GAD
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6 months
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Mean length between on set of symptoms and diagnosis in OCD
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9 years
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Prevalence mental health difficulties in children
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10%
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Of children with mental health problems how many are in touch with specialist services
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10%
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Prevalence of autistic spectrum disorder
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1%
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Prevalence Kanner's autism
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10 in 10,000
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Prevalence of ADHD by DSM-V definition
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5%
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Prevalence of ADHD by ICD-10 definition
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1%
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Prevalence dyslexia
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10%
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Prevalence severe dyslexia
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4%
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IQ score in mild intellectual disability
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50-69
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IQ score in moderate intellectual disability
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35-49
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IQ score in severe intellectual disability
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20-34
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IQ score in profound learning disability
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<20
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Prevalence epilepsy in those with IQ <50 by age 22
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44%
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Daily recommend limits alcohol consumption for men (units)
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3-4
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Daily recommend limits alcohol consumption for women (units)
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2-3
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Weekly recommend limits alcohol consumption for men (units)
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21
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Weekly recommend limits alcohol consumption for women (units)
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14
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Prevalence alcohol dependence in men
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7%
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Prevalence alcohol dependence in women
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2%
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Percentage of emergency hospital admissions related to alcohol
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25%
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Percentage of psychiatric admissions related to alcohol
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10%
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After alcohol detox how many remain abstinent at one year
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20-50%
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What percentage of alcohol misusers will suffer from alcohol withdrawal syndrome
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40%
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What percentage of those with alcohol withdrawal syndrome go one to get delirium tremens
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5%
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What is the mortality rate in untreated delirium tremens
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15%
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What percentage of patients recover from Wernicke's encephalopathy
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20%
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What percentage of patients die from Wernicke's encephalopathy
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10%
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What percentage of those with Wernike's encephalopathy go on to develop Korsakov syndrome
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70%
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How long does a section 2 of the MHA last?
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28 days
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How long does a section 3 of the MHA last?
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6 months
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How long does a section 4 of the MHA last?
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72 hours
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How long does a section 5(2) of the MHA last?
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72 hours
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How long does a section 5(4) of the MHA last?
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6 hours
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How long does a section 135 of the MHA last?
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72 hours
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How long does a section 136 of the MHA last?
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72 hours
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What percentage of post-partum women get the 'blues'
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50-80%
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With a previous history of post-partum depression what is the chance of recurrence
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50%
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General population risk of puerperal psychosis
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0.2%
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Risk of puerperal psychosis in bipolar disorder or previous history of puerperal psychosis
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50%
