[The Navarra study (PECNA). Hyperlipidemia III. Variations in the median HDL levels and lipid risk quotient in children and adolescents based on age and gender]. / Estudio de Navarra (PECNA). Hipelipemias III. Variaciones de los niveles medios HDL y de los cocientes de riesgo lipídico de una población infanto-juvenil según edad y sexo.

As part of an epidemiological study on cardiovascular risk factors among children and adolescents in Navarra, lipids and lipoproteins were analyzed in 5,829 children of both sexes. The subjects were between 4 and 17 years of age and were selected at random from the school population in our community. In this article we analyze the variations in HDL-cholesterol and cholesterol/HDL and LDL/HDL risk quotients according to age and sex. Beginning at the age of 10, the HDL decreases in both sexes, although this decrease is more evident among males and they obtain levels lower than those during early childhood. Among females older than 14 there is a slight increase. Apparently the decrease in HDL among male adolescents is due to an increase in the production of testosterone during this stage of life. Both risk quotients decrease until the children are 10 years of age, after which they increase among males and stabilize or slightly decrease among females. For this reason, scores are higher for males during the last years of adolescence. The cardiovascular lipid risk increases with age and during adolescence in higher among males and depends more on the variations in HDL than on variations in cholesterol or LDL. We believe that the best definition for cardiovascular lipid risk during the infancy or adolescents is one which is based on the risk quotients.

[Study from Navarra. Hyperlipidemia II. Variations according to age and sex in the average cholesterol level, LDL-cholesterol and triglycerides in an infant-child population]. / Estudio de Navarra (PECNA). Hiperlipemias II. Variaciones de los niveles medios de colesterol total, LDL-colesterol y triglicéridos de una población infanto-juvenil según edad y sexo.

As part of an epidemiological study on cardiovascular risk factors among children and adolescents in Navarra, lipids and lipoproteins were analysed in 5,829 children. The study group was selected at random from the school population in our community and included students of both sexes between 4 and 17 years of age. In this article we describe the variations from 4 to 10 years of age in both sexes and decrease from that age on. Among males older than 14, they continue decreasing, while they become stable in females. For this reason, values during childhood are higher than during adolescence in both sexes, and within this period, males show lower levels than girls. Variations in LDL serum levels according to age and sex are similar to those recorded with cholesterol. The triglyceride serum levels increase in line with age among boys. With girls, something similar happens until they are 13. Starting from this age, there is an inversion showing lower levels than the male adolescents. In both sexes, levels during adolescence are higher than during childhood.