Correlation between age and MMSE in schizophrenia.

Area of Science:

• Neuroscience
• Psychiatry
• Gerontology

Background:

• The Mini-Mental State Examination (MMSE) is a common cognitive screening tool used in schizophrenia research.
• Normative MMSE data for the schizophrenia population are limited.
• Aging effects on cognitive function in schizophrenia require further investigation.

Purpose of the Study:

• To analyze the impact of aging on Mini-Mental State Examination (MMSE) scores in patients with schizophrenia.
• To compare the rate of cognitive decline due to aging between institutionalized and community-dwelling schizophrenia patients.

Main Methods:

• A systematic literature search was conducted using PubMed and PsychInfo with keywords 'schizophrenia' and 'MMSE'.
• Included studies provided MMSE scores and mean age for schizophrenia patients.
• A weighted linear regression analysis was performed, with weights inversely proportional to the variance of the age variable.

Main Results:

• A meta-regression analysis of 56 articles (5,588 patients) revealed that MMSE scores in schizophrenia patients decline by approximately 1 point every four years.
• This rate of decline is five times greater than that observed in the general population.
• Institutionalized patients showed a significant decline in MMSE scores with age (R² = 0.622), while community-dwelling patients exhibited relatively stable scores (R² = 0.037).

Conclusions:

• Significant differences in age-related cognitive trajectories exist between institutionalized and community-dwelling schizophrenia patients.
• Factors such as illness severity, medication, vascular risks, and environmental stimulation may contribute to cognitive decline in institutionalized patients.
• Further research on executive functions and the impact of specific variables is recommended for a comprehensive understanding of cognitive aging in schizophrenia.