Pereira, M.Lira, D.Bacelar, C.Oliveira, J.de Carvalho, A.2016-07-262016-07-262015-06Arch Endocrinol Metab. 2015 Jun;59(3):231-52359-3997http://hdl.handle.net/10400.16/1975Haemoglobin A1c (Hb A1c) is routinely used for monitoring glycemic control in patients with diabetes. Hb A1c seasonal fluctuations can be directly related to different biological, geographical and cultural influences. Our purpose was to evaluate seasonal variation of Hb A1c in a hospital-based adult population over a period of 5 years.engAdultAge FactorsAgedAged, 80 and overBlood GlucoseDiabetes MellitusHemoglobin A, GlycosylatedHumansMiddle AgedPortugalReference ValuesRetrospective StudiesSex FactorsStatistics, NonparametricTime FactorsYoung AdultSeasonsjournal article10.1590/2359-3997000000043