Gestational weeks | SP group | IVF group | t-text | p value | ||
---|---|---|---|---|---|---|
 | Average FF (%) | SD | Average FF (%) | SD |  |  |
12+0–15+6 (weeks) | 10.95 | 4.14 | 10.67 | 4.04 | 1.26 | 0.21 |
16+0–19+6 (weeks) | 11.18 | 4.18 | 10.25 | 4.52 | 4.55 | < 0.05 |
20+0–23+6 (weeks) | 11.86 | 4.39 | 12.01 | 5.57 | − 0.14 | 0.89 |
24+0–26+6 (weeks) | 13.89 | 4.89 | 15.84 | 4.46 | − 0.97 | 0.33 |
Total (weeks) | 11.23 | 4.22 | 10.51 | 4.36 | 4.77 | < 0.05 |