title: Seasonal variation of haemoglobin A1 in children with insulin-dependent diabetes mellitus.
abstract: The results of three controlled trials performed on children with insulin-dependent diabetes mellitus were examined for evidence of seasonal variation in concentrations of glycosylated haemoglobin (HbA1). All three studies showed lower levels during the summer months. Multiple regression analysis showed that the month of sampling accounted for a significant proportion of the total variance in HbA1 levels (P less than 0.001 in all three studies). We suggest that exercise, dietary changes and the frequency of minor illnesses may all contribute to this fluctuation which has important implications for the design of clinical trials in childhood diabetes.
authors.affiliation: Department of Child Health, University Hospital, Nottingham, United Kingdom.
authors.forename: F R
authors.initials: FR
authors.lastname: Hinde
authors.forename: P J
authors.initials: PJ
authors.lastname: Standen
authors.forename: N P
authors.initials: NP
authors.lastname: Mann
authors.forename: D I
authors.initials: DI
authors.lastname: Johnston
mesh_terms: D000293:Adolescent; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000097:blood*; D006442:Glycated Hemoglobin / Q000032:analysis*; D006801:Humans; D012044:Regression Analysis; D012621:Seasons; D013223:Statistics as Topic
chemical_list: D006442:Glycated Hemoglobin