| Table 8. Correlation between yolk sac diameter in first trimester scan and biparietal diameter(mm), abdominal circumference (mm) femur length (mm), estimated fetal weight (gm) gestational age by us (weeks) amniotic fluid index(mm) in the second trimester scan. | ||||
| Yolk sac 2-5mm (n=87) |
Yolk sac >5mm (n=27) |
t-test | p-value | |
|---|---|---|---|---|
| Biparietal diameter(mm) Mean±SD Range |
41.35±10.14 29-a82 |
43.99±13.33 29.1-a82 |
0.973 |
0.326 |
| Abdominal circumference (mm) Mean±SD Range |
126.81±34.90 82-a201.8 |
139.73±40.62 82-a201.8 |
2.090 |
0.151 |
| Femur length Mean±SD Range |
32.24±30.20 18-a299 |
31.50±8.94 19.1-a48 |
0.012 |
0.913 |
| Estimated fetal weight (gm) Mean±SD Range |
296.53±172.63 110-a820 |
360.85±208.52 138-a730 |
2.078 |
0.152 |
| Gestational age on US (weeks) Mean±SD Range |
18.20±2.69 15-a24 |
19.05±3.12 15-a24 |
1.531 |
0.219 |
| Amniotic fluid index (mm) Mean±SD Range |
136.44±36.12 77.1-a228 |
137.00±47.28 11-a220 |
0.003 |
0.954 |
T-Independent Sample t-test; p-value >0.05 S.