Month of birth and mental disorders: A population‐based study and validation using global meta‐analysis

Abstract

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The effect of ultraviolet radiation on the incidence and severity of major mental illness using birth month, birth year, and sunspot data

“…In the past two decades there have been many papers describing the effect of month and year of birth on the incidence of a variety of human diseases (see Table 1 ) [ 2 ]. Recently, a global meta-analysis reaffirmed that month of birth was associated with major mental disorders [ 3 ]. In addition, there is increasing interest in how environment affects the epigenome which controls the expression of the genetic library in DNA [ 4 , 5 ].…”

Differences in Psychiatric Comorbidities and Gender Distribution among Three Clusters of Personality Disorders: A Nationwide Population-Based Study

“…We included patients with a diagnosis of cluster A PDs (ICD: 301.0, 301.20, 301.22), cluster B PDs (ICD: 301.50, 301.7, 301.81, 301.83), or cluster C PDs (ICD: 301.4, 301.6, 301.82) during the period between 1 January 1995 and 31 December 2013. To ensure diagnostic validity, patients were defined as an ICD code of the same cluster PDs based on the diagnostic interviews and clinical judgments of psychiatrists in inpatient or outpatient settings at least twice; such a definition was adopted in a previous study [ 14 ]. For each patient, the date of diagnosis (age at diagnosis) was defined as the first day of the diagnosis of PDs.…”

Climatic exposures in childhood and the risk of schizophrenia from childhood to early adulthood

“…We controlled for several potential confounderssex, birth year, birth month, history of parental mental disorders, parental socioeconomic characteristics, area-level socioeconomic characteristics and degree of urbanizationwith known or hypothesized relationships to the exposures and outcomes (Fett et al, 2019;Hakulinen et al, 2020;Hsu et al, 2021;Mortensen et al, 2010;Sariaslan et al, 2015). Data on the history of parental mental disorders (1 = diagnosis of any mental disorder; 0 = no diagnosis) before the person's 10th birthday were obtained from the Care Register for Health Care.…”

“…Season of birth is an established early-life risk factor in schizophrenia, with greater incidence of schizophrenia among people born in winter and early spring (Brown, 2011;Davies et al, 2003;Escott-Price et al, 2019;Hsu et al, 2021;Suvisaari et al, 2001). Studies have also documented seasonality as a proximal risk factor triggering the acute onset or exacerbation of schizophrenia.…”