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Table 1 Summary statistics of the abdominal circumference and estimated fetal weight at each completed gestational week

From: Unconditional and conditional standards for fetal abdominal circumference and estimated fetal weight in an ethnic Chinese population: a birth cohort study

Completed gestational week Abdominal circumference (mm) Estimated fetal weight (gram)
Both Genders Pooled Male Female Both Genders Pooled Male Female
N Mean SD N Mean SD N Mean SD N Mean SD N Mean SD N Mean SD
18 10 133 7 8 134 8 2 131 2 9 244 25 7 243 26 2 250 26
19 81 142 7 38 144 7 43 140 7 80 288 26 37 295 29 43 282 23
20 148 153 7 79 154 6 69 151 7 146 344 32 79 348 31 67 340 32
21 57 161 8 35 163 6 22 158 9 55 393 37 33 403 29 22 379 43
22 5 158 7 1 151 -- 4 160 7 4 408 43 0 -- -- 4 408 43
24 3 201 4 2 202 6 1 199 -- 3 748 14 2 743 16 1 758 --
25 17 207 11 8 206 10 9 207 12 16 787 78 7 777 79 9 794 82
26 120 215 10 67 217 9 53 213 10 118 894 83 66 903 84 52 883 81
27 122 223 9 62 225 8 60 221 9 121 1005 98 62 1023 97 59 986 98
28 36 233 11 20 235 10 16 232 12 36 1132 128 20 1139 109 16 1123 151
29 8 245 9 6 248 8 2 238 8 8 1281 105 6 1331 57 2 1130 6
30 3 251 5 1 254 -- 2 250 6 2 1452 97 1 1521 -- 1 1384 --
31 23 269 12 12 268 15 11 270 8 21 1744 164 10 1715 198 11 1771 130
32 151 279 12 80 280 12 71 278 13 151 1898 189 80 1922 186 71 1871 189
33 116 287 13 63 289 11 53 284 14 112 2063 207 62 2101 192 50 2016 218
34 15 295 10 9 299 7 6 289 12 15 2239 201 9 2308 162 6 2134 223
35 5 305 21 2 288 11 3 316 18 4 2458 429 2 2156 204 2 2761 381
  1. N number of measurements, SD standard deviation