The weight L, M and S parameters of the Fenton growth chart Weeks L M S 22 1.0 0.481 0.156 23 1.0 0.575 0.170 24 1.0 0.670 0.183 25 1.0 0.770 0.198 26 1.0 0.877 0.212 27 1.0 0.995 0.222 28 1.0 1.128 0.228 29 1.0 1.277 0.230 30 1.0 1.446 0.228 31 1.0 1.635 0.222 32 1.0 1.846 0.211 33 1.0 2.073 0.199 34 1.0 2.309 0.186 35 1.0 2.553 0.174 36 1.0 2.796 0.162 37 1.0 2.992 0.157 38 1.0 3.188 0.153 39 1.0 3.384 0.149 40 1.0 3.581 0.146 41 1.0 3.757 0.145 42 1.0 3.927 0.144 43 1.0 4.099 0.142 44 1.0 4.271 0.140 45 1.0 4.453 0.138 46 1.0 4.618 0.137 47 1.0 4.799 0.135 48 1.0 4.976 0.133 49 1.0 5.147 0.131 50 1.0 5.305 0.132 Z = (Measurement / M)^L - 1 L * S

The length L, M and S parameters of the Fenton growth chart Weeks L M S 22 1.0 28.720 0.079 23 1.0 30.303 0.076 24 1.0 31.893 0.073 25 1.0 33.372 0.071 26 1.0 34.851 0.069 27 1.0 36.330 0.067 28 1.0 37.809 0.065 29 1.0 39.103 0.063 30 1.0 40.398 0.060 31 1.0 41.693 0.058 32 1.0 42.987 0.056 33 1.0 44.042 0.054 34 1.0 45.098 0.051 35 1.0 46.155 0.049 36 1.0 47.212 0.047 37 1.0 48.190 0.046 38 1.0 49.168 0.045 39 1.0 50.146 0.044 40 1.0 51.114 0.043 41 1.0 51.859 0.043 42 1.0 52.693 0.043 43 1.0 53.469 0.043 44 1.0 54.238 0.042 45 1.0 54.960 0.042 46 1.0 55.681 0.042 47 1.0 56.437 0.041 48 1.0 57.103 0.041 49 1.0 57.679 0.042 50 1.0 58.301 0.041 Z = (Measurement / M)^L - 1 L * S

The head circumference L, M and S parameters of the Fenton growth chart Weeks L M S 22 1.5 19.734 0.071 23 1.5 20.875 0.069 24 1.5 22.017 0.067 25 1.5 23.094 0.065 26 1.5 24.172 0.063 27 1.5 25.249 0.061 28 1.5 26.327 0.060 29 1.5 27.200 0.058 30 1.5 28.074 0.056 31 1.5 28.947 0.055 32 1.5 29.821 0.053 33 1.5 30.569 0.052 34 1.5 31.317 0.051 35 1.5 32.065 0.050 36 1.5 32.812 0.049 37 1.5 33.421 0.049 38 1.5 34.031 0.049 39 1.5 34.640 0.049 40 1.5 35.232 0.048 41 1.5 35.842 0.047 42 1.5 36.421 0.045 43 1.5 37.023 0.044 44 1.5 37.578 0.043 45 1.5 38.027 0.041 46 1.5 38.450 0.040 47 1.5 38.833 0.039 48 1.5 39.188 0.039 49 1.5 39.547 0.039 50 1.5 39.805 0.038 Z = (Measurement / M)^L - 1 L * S

Table for converting Z-scores to percentiles

z-score percentile z-score percentile z-score percentile -2.33 1 -0.41 34 0.44 67 -2.05 2 -0.39 35 0.47 68 -1.88 3 -0.36 36 0.50 69 -1.75 4 -0.33 37 0.52 70 -1.64 5 -0.31 38 0.55 71 -1.55 6 -0.28 39 0.58 72 -1.48 7 -0.25 40 0.61 73 -1.41 8 -0.23 41 0.64 74 -1.34 9 -0.20 42 0.67 75 -1.28 10 -0.18 43 0.71 76 -1.23 11 -0.15 44 0.74 77 -1.17 12 -0.13 45 0.77 78 -1.13 13 -0.10 46 0.81 79 -1.08 14 -0.08 47 0.84 80 -1.04 15 -0.05 48 0.88 81 -0.99 16 -0.03 49 0.92 82 -0.95 17 0.00 50 0.95 83 -0.92 18 0.03 51 0.99 84 -0.88 19 0.05 52 1.04 85 -0.84 20 0.08 53 1.08 86 -0.81 21 0.10 54 1.13 87 -0.77 22 0.13 55 1.17 88 -0.74 23 0.15 56 1.23 89 -0.71 24 0.18 57 1.28 90 -0.67 25 0.20 58 1.34 91 -0.64 26 0.23 59 1.41 92 -0.61 27 0.25 60 1.48 93 -0.58 28 0.28 61 1.55 94 -0.55 29 0.31 62 1.64 95 -0.52 30 0.33 63 1.75 96 -0.50 31 0.36 64 1.88 97 -0.47 32 0.39 65 2.05 98 -0.44 33 0.41 66 2.33 99