Seasonality of suicidal behavior has been investigated regarding both neurobiological and climatic factors, as well as psychopathological and social aspects. Most of the studies detectedpeaks in late spring and troughs in the winter. Several lines of evidence evaluated the role of extended periods of light associated with probability of suicides whereas others summarize the alterations of melat...

Sir, In reference to the paper by Avasthi et al. (1996) regarding "Seasonality and Recurrent Mania" I have to say that this is very common observation which every psychiatrist do recognize i.e. many a patient do suffer only from mania year after year for many consecutive years with no trace of depression in between. I have also come across such patients which forms a respectable proportion of a...

Using MRSA isolates submitted to our hospital microbiology laboratory January 2001-March 2010 and the number of our emergency department (ED) visits, quarterly community-associated (CA) and hospital-associated (HA) MRSA infections were modeled using Poisson regressions. For pediatric patients, approximately 1.85x (95% CI 1.45x-2.36x, adj. p<0.0001) as many CA-MRSA infections per ED visit occurr...

A seasonal suicide peak in spring is highly replicated, but its specific cause is unknown. We reviewed the literature on suicide risk factors which can be associated with seasonal variation of suicide rates, assessing published articles from 1979 to 2011. Such risk factors include environmental determinants, including physical, chemical, and biological factors. We also summarized the influence ...

In this review, we have attempted to summarize, based on recent data obtained in our laboratory and elsewhere, our current understanding of the regulatory mechanisms of seasonality and discuss the implications with regard to treatment strategies to advance the onset of cyclic reproductive activity in the early spring.

Our objective in this study was to evaluate a causal relationship between vestibular pathological findings and climatic variations during the year (summer, autumn, winter, and spring). The study was conducted in a Brazilian clinic located in a tropical climate and having well-defined warm and cold weather. For this retrospective study, our outpatients were the subjects, and the diagnosis was ma...

Seasons are the complex nonlinear response of the physical climate system to regular annual solar forcing. There is no a priori reason why they should remain fixed/invariant from year to year, as is often assumed in climate studies when extracting the seasonal component. The widely used econometric variant of Census Method II Seasonal Adjustment Program (X-11), which allows for year-to-year var...