Week of gestation | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 |
Number of observations | 36 | 50 | 51 | 54 | 56 | 76 | 74 | 78 | 83 | 69 | 70 | 103 | 80 | 86 |
Minimum | 100 | 80 | 80 | 80 | 80 | 80 | 80 | 100 | 100 | 150 | 150 | 150 | 200 | 200 |
25th percentile | 120 | 90 | 100 | 100 | 115 | 100 | 150 | 150 | 160 | 200 | 200 | 220 | 250 | 250 |
Median | 150 | 147 | 150 | 150 | 160 | 160 | 170 | 165 | 200 | 220 | 235 | 250 | 250 | 250 |
75th percentile | 250 | 190 | 180 | 175 | 175 | 180 | 200 | 200 | 240 | 250 | 250 | 270 | 270 | 280 |
Maximum | 330 | 330 | 330 | 330 | 330 | 330 | 330 | 330 | 330 | 330 | 33 | 370 | 370 | 380 |
Mean | 181 | 155 | 155 | 155 | 163 | 156 | 175 | 176 | 198 | 224 | 226 | 240 | 262 | 269 |
Standard deviation | 69 | 72 | 72 | 70 | 67 | 63 | 55 | 53 | 45 | 45 | 45 | 43 | 35 | 39 |
Lower 95% | 158 | 134 | 135 | 137 | 146 | 142 | 163 | 164 | 188 | 213 | 215 | 231 | 255 | 261 |
Upper 95% | 205 | 176 | 175 | 175 | 182 | 171 | 189 | 189 | 208 | 235 | 237 | 248 | 271 | 278 |