Incidence of diabetes mellitus type 1 in children aged 0-15. Sources [22–26]:. Secondary results from Tuchinda et al. 2002. Notes: Results from a study in Bangkok were not included as they were not comparable with the other studies due to the different methodology employed . There was another study looking at the seasonal variation in DMT1 which was not included because it did not report incidence rates but only total number of cases in one hospital which made it unsuitable to calculate population incidence rates . Incidence was calculated by dividing the total number of cases reported by hospitals with the total child population in the hospitals’ catchment area. Data were obtained from retrospective postal survey or medical record analysis and no information on the diagnostic criteria used was provided. A study summarising the results of the regional studies mentions that the criteria in the 1997 Report of the Expert Committee on the Diagnosis and Classification of Diabetes Mellitus were used.