From: Can trans-cerebellar diameter supersede other fetal biometry in measuring gestational age? A prospective study
S. no
Gestational age
Frequency
Percentage
1
16–20 w 6 d
31
23.8
2
21 w–28 w 6 d
49
37.7
3
29 w–32 w 6 d
28
21.5
4
33 w–36 w 6 d
22
16.9
Total
130
100.0