Which of the following statements about schizophrenia is not correct?

Question

BlackTom AI · Accepted Answer

Schizophrenia has a lifetime prevalence of about 1% worldwide, so a statement claiming 5–6% is incorrect.

1. Relevant knowledge points and concepts
- Epidemiology: lifetime prevalence of schizophrenia is generally reported around 0.5–1.0% (commonly cited ≈1%), not 5–6%.  
- Sex and age patterns: males typically have earlier onset; women show a secondary peak in incidence in later life.  
- Mortality: people with schizophrenia have reduced life expectancy (often by 10–20 years) due to higher rates of suicide, accidental death, and physical comorbidities.  
- Psychotic-like experiences: prevalence of auditory hallucinations and other psychotic-like experiences in the general (non-clinical) population tends to decline with increasing age.

2. Step-by-step reasoning
- Compare the claimed prevalence (5–6%) with established epidemiological figures (~1%).  
- Translate percentages into counts for clarity: per 1,000 people, 1% corresponds to 10 cases, while 5% corresponds to 50 cases (and 6% to 60 cases). Established data align with about 10 per 1,000, not 50–60 per 1,000.

3. Intermediate calculations
- 1% of 1,000 = 0.01 × 1,000 = 10 people.
- 5% of 1,000 = 0.05 × 1,000 = 50 people.
Thus 5–6% would be 5–6 times the accepted prevalence.

4. Why the correct answer is correct
- Because accepted epidemiological studies and textbooks report lifetime prevalence near 1%, the choice stating 5–6% is factually wrong—an overestimate by severalfold.

5. Why the other options are correct (briefly)
- “More women than men develop schizophrenia in later life”: true—women have a later-onset second peak.  
- “Life expectancy is less than average due to suicides, accidents and other factors”: true—schizophrenia is associated with substantially reduced life expectancy driven by suicide, accidents, and comorbid physical illness.  
- “Prevalence of auditory hallucinations in the general population decreases as a function of age”: true—psychotic-like experiences are more common in younger age groups and decline with age.

6. Conclusion
The incorrect statement is “the lifetime prevalence rate is 5-6%,” which contradicts established prevalence (~1%). This confirms the provided answer.

Which of the following statements about schizophrenia is not correct?Single choice

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