We have studied 1,939 healthy children of both sexes (1.003 boys and 936 girls), aged from 4 to 18 years, of the city of Fuenlabrada (Madrid). The following parameters were determined: blood pressure, weight, height, triccipital folds, the rohrer index, total cholesterol, triglycerides, lipoproteins, blood sugar and uric acid. The results of the blood pressure have been expressed by means of percentiles in relation with age, weight, and height. The correlation coefficients have been statistically significant for the height, weight, age, triccipital skinfolds, triglycerides and C-VLDL. We have relationed our results with other national and international studies.