Season of Birth in Schizophrenia in the Mexico City Area: Comparison with General Population
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The relationship between seasonal changes and mental disorders has been extensively studied in the northern and southern hemispheres. In both cases, the results show that there is a higher rate of schizophrenic births during the winter months. The present study attempts to prove the existence of this phenomena in Mexico City, an area that does not undergo extreme weather variations throughout the year. A total of 2,288 schizophrenic patients was considered for this study. Their date of birth was compared to that of the general population of the Mexico City area, a total of 4,848,119 individuals. The number of births was evaluated according to the number of days in each month. The distribution of the births of schizophrenics was compared to the reference population by means of a Kolmogorov-Smirnov test and a X2 contrast. The annual rhythm of births of schizophrenics was determined through an analysis of the Estimated Seasonal Component. There was a slight, non-significant increment in schizophrenic births in December and autumn, as compared with the general population birth rate. Interestingly, it was found that births in the control population decreased significantly in December when compared with all the other months. Results were discussed in relation to the geographical location of Mexico, which lies in a tropical zone, and as a consequence minimal seasonal effects.
URI
http://repositorio.inprf.gob.mx/handle/123456789/5078https://doi.org/10.1076/brhm.34.5.485.27855
Colecciones
Titulo en otros idiomas [TO]
Season of Birth in Schizophrenia in the Mexico City Area: Comparison with General Population
Fecha
2003Autor
Nivel de acceso
acceso cerrado
Nombre de la Rev. [SO]
Biological Rhythm Research
Volumen [VL], Número [SU], Paginación [PG]
34 (5) 485-492 p. versión del editor
Idioma [LA]
eng
Palabras clave otro idioma [KO], Descriptores [Mesh], Descriptores [Meshm]
Tipo de documento [TP]
article
DOI [DO]
http://dx.doi.org/10.1076/brhm.34.5.485.27855