孕周双顶径(平均值)cm腹围(平均值)cm股骨长(平均值)cm
13周2.52士0.256.90士l.651.17士0.31
14周2.83士0.577.77士1.821.38士0.48
15周3.23士0.519.13士1.561.74士0.58
16周3.62士0.5810.32士1.922.10士0.51
17周3.97士0.4411.49士1.622.52士0.44
18周4.25士0.5312.41士l.892.71士0.46
19周4.52士0.5313.59士2.303.03士0.50
20周4.88士0.5814.80士l.893.35士0.47
21周5.22士0.4215.62士1.843.64士0.40
22周5.45士0.5716.70士2.233.82士0.47
23周5.80士0.4417.90士1.854.21士0.41
24周6.05士0.5018.74士2.234.36士0.51
25周6.39士0.7019.64士2.204.65士0.42
26周6.68士0.6121.62士2.304.87士0.41
27周6.98士0.5721.81士2.125.10士0.41
28周7.24士0.6522.86士2.415.35士0.55
29周7.50士0.6523.71士1.505.61士0.44
30周7.83士0.6224.88士2.035.77士0.47
31周8.06士0.6025.78士2.326.03士0.38
32周8.17士0.6526.20士2.336.43士0.49
33周8.50士0.4727.78士2.306.52士0.46
34周8.61士0.6327.99士2.556.62士0.43
35周8.70士0.5528.74士2.886.71士0.45
36周8.81士0.5729.44士2.836.95士0.47
37周9.00士0.6330.14士2.177.10士0.52
38周9.08士0.5930.63士2.837.20士0.43
39周9.21士0.5931.34士3.127.34士0.53
40周9.28士0.5031.49士2.797.40士0.53