Serum folate levels in schizophrenia: A meta-analysis

Area of Science:

• Neuroscience
• Psychiatry
• Nutritional Science

Background:

• Schizophrenia (SZ) is a complex mental disorder with multifactorial etiology.
• Nutritional factors, particularly folate levels, have been investigated for their potential role in SZ development.
• Existing research presents conflicting findings regarding the association between serum folate and SZ risk.

Purpose of the Study:

• To conduct a comprehensive meta-analysis clarifying the relationship between serum folate levels and schizophrenia risk.
• To identify specific subgroups where this association is most pronounced.
• To assess the statistical power and reliability of the findings.

Main Methods:

• A systematic meta-analysis of studies sourced from PubMed, Embase, and Web of Science.
• Inclusion of studies without language restrictions.
• Weighted mean difference (WMD) was used as the summary statistic.
• Subgroup analyses were performed based on publication language, ethnicity, disease duration, measurement time, gender, and age.
• Power analysis was conducted to evaluate the robustness of the results.

Main Results:

• A significant association was found between decreased serum folate and increased SZ risk across total studies.
• This association was confirmed in subgroups including English publications, Caucasians, Asians, acute SZ patients, measurements taken after drug use, and individuals under 50 years old.
• Subgroups lacking significant associations often had lower statistical power, suggesting potential for Type II errors.

Conclusions:

• Folate deficiency is associated with an increased risk of schizophrenia.
• The association is robust in several key subgroups, highlighting the importance of folate status in SZ.
• Subgroups with non-significant findings require further investigation with adequate statistical power to confirm or refute the association.