Meta-analysis of Paternal Age and Schizophrenia Risk in Male Versus Female Offspring

Overview

Journal Schizophr Bull

Publisher Oxford University Press

Specialty Psychiatry

Date 2010 Feb 27

PMID 20185538

Citations 77

Authors

Brian Miller

Erick Messias

Jouko Miettunen

Antti Alaraisanen

Marjo-Riita Jarvelin

Hannu Koponen

Pirkko Rasanen

Matti Isohanni

Brian Kirkpatrick

Affiliations

Soon will be listed here.

Abstract

Introduction: Advanced paternal age (APA) is a reported risk factor for schizophrenia in the offspring. We performed a meta-analysis of this association, considering the effect of gender and study design.

Methods: We identified articles by searching Pub Med, PsychInfo, ISI, and EMBASE, and the reference lists of identified studies. Previously unpublished data from the Northern Finland 1966 Birth Cohort (NFBC 1966) study were also included.

Results: There were 6 cohort studies and 6 case-control studies that met the inclusion criteria. In both study designs, there was a significant increase in risk of schizophrenia in the offspring of older fathers (≥30) compared to a reference paternal age of 25-29, with no gender differences. The relative risk (RR) in the oldest fathers (≥50) was 1.66 [95% confidence interval (95% CI): 1.46-1.89, P < 0.01]. A significant increase in risk was also found for younger fathers (<25) in males (RR = 1.08, 95% CI: 1.02-1.14, P = 0.01) but not females (RR = 1.04, 95% CI: 0.97-1.14, P = 0.28). The population attributable risk percentage (PAR%) was 10% for paternal age ≥30 and 5% for paternal age <25.

Discussion: Both APA (≥30) and younger paternal age (<25) increase the risk of schizophrenia; younger paternal age may be associated with an increased risk in males but not females. This risk factor increases the risk of schizophrenia as much as any single candidate gene of risk. The mechanism of these associations is not known and may differ for older and younger fathers.

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