The paper consists of two parts. In the first part the linear regression method is described, also employment possibilities and pupil achievement research are discussed. The second one deals with some factors and what influence they have on the eight class pupil’s mathematical achievement analysis.

Darbo tikslas Įvertinti pacientų, vaikystėje susirgusių pirmo tipo cukriniu diabetu (iki 15 m.), mirtingumo ir komplikacijų išsivystymo ypatumus. Darbo uždaviniai 1. Įvertinti standartizuotus mirtingumo rodiklius 1983–2005 metais. 2. Įvertinti ir palyginti standartizuotus mirtingumo rodiklius 1983–1995 m. ir 1996–2005 m. laikotarpiais. 3. Įvertinti mirties priežastis. 4. Įvertinti cukrinio diabeto komplikacijų išsivystymo ypatumus. / The aim of the study was to evaluate the characteristics of mortality and development of diabetes complications in patients with childhood-onset (under the age of 15 years) type 1 diabetes mellitus. The objectives of the study: 1. To evaluate the standardized mortality ratios in 1983–2005. 2. To evaluate and compare the standardized mortality ratios between the periods of 1983–1995 and 1996–2005. 3. To determine the causes of death. 4. To evaluate the characteristics of development of diabetes compli-cations.