Exploring seasonal variation in mania among adults presenting to a tertiary care hospital in South India
Abstract
Seasonal variations in mania have been reported consistently from
temperate regions but its occurrence in the tropics has been less studied. There are very few studies
that have been done in India. OBJECTIVE-To explore the existence of a seasonal trend in the
occurrence of mania among adult outpatients in a tertiary care hospital in Tamil nadu.
METHODOLOGY-A review of all new cases of mania presenting to our institution was done. Newly
registered cases diagnosed as any mania and first episode mania from January 2010 to December
2011 were identified. Cosinor analysis was used to check for seasonality. Separate analyses were
done for patients presenting with any mania and for first episode mania.RESULTS-The mean event
rate was 17.3 per month and 8.5 per month for any mania and for first episode mania respectively.
Cosinor analysis was also done to assess seasonality but did not to show any significant seasonal
trend, p 0.13 for any mania and p 0.35 for first episode mania. Conclusion-The results suggest that
there is no significant evidence for seasonality of manic episodes in our sample.
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