C H A P T E R 2 percentiles give an indication of the percentage of the concerning population that is below a certain value. For example, a P3 value for height of 92 cm means that 3 % of the concerning population has a length below 92 cm. The P50 value is the median; 50% of the concerning population has a length below and 50% a length above this value. At the P3 the difference in weight starts at 108 grams ending up with a differ-‐ ence of 1071 grams for girls. At the P50 the difference in weight starts at the age of five years, with a difference of 300 grams ending up at the age of ten years with a difference of 3200 grams. In boys the difference mean weight also starts at the age of five years beginning with 400 grams and ending up at the age of ten years with 2400 grams. At the P97 curve the deviation starts at the age of four years with 797 grams to a maximum difference of 7447 grams at ten years for girls. Table 1: Differences in weight and height of girls until the age of ten years between the study of Fred-‐ 30 riks (1996-‐1997) and van Wieringen (1964-‐1966). height (cm) weight (gr) Age (y) P3 P50 P97 P3 P50 P97 0.27 -‐0.5 -‐0.9 -‐0.7 115 -‐10 -‐23 0.31 -‐0.5 -‐0.9 -‐0.8 41 -‐30 11 0.38 -‐0.6 -‐0.8 -‐0.6 27 -‐20 35 0.46 -‐0.6 -‐0.8 -‐0.8 -‐47 -‐70 -‐1 0.54 -‐0.7 -‐0.8 -‐0.7 -‐159 20 9 0.62 -‐0.7 -‐0.8 -‐0.8 -‐155 -‐150 -‐63 0.69 -‐0.9 -‐0.8 -‐0.7 -‐205 -‐280 -‐179 0.77 -‐0.9 -‐0.8 -‐0.8 -‐199 -‐280 -‐165 0.85 -‐0.9 -‐0.7 -‐0.5 -‐233 -‐330 -‐201 0.92 -‐0.8 -‐0.6 -‐0.5 -‐267 -‐350 -‐281 1 -‐0.7 -‐0.5 -‐0.5 -‐193 -‐450 -‐243 2 0.1 -‐0.2 -‐1.0 -‐257 -‐500 -‐590 3 0.1 0.2 0.0 -‐22 -‐200 -‐38 4 0.0 0.3 0.5 108 0 797 5 0.8 0.9 1.1 150 300 1425 6 1.5 1.4 1.5 498 1000 2536 7 1.7 1.9 2.3 751 1500 3817 8 2.2 2.5 2.7 817 2000 5268 9 2.8 3.3 3.7 888 2500 6508 10 3.3 4.3 3.8 1071 3200 7447
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