Table 3 Summary statistics of the ultrasound data of 190 low-risk pregnant women presented with subgroups (males and females), the number of measurements (n), mean, standard deviation (SD), 95% confidence interval of the mean (95% CI), and p-value (p) for the between-group tests.
Term | Sex | n | Mean | SD | 95% CI | p* |
|---|---|---|---|---|---|---|
Week 7: 1st measurement; GA (weeks) | 180 | 7.6 | 0.7 | (7.5–7.7) | ||
♂ | 89 | 7.5 | 0.5 | (7.4–7.6) | 0.08 | |
♀ | 91 | 7.7 | 0.9 | (7.5–7.8) | ||
Week 7: 1st yolk sac diameter (mm) | 180 | 4.7 | 0.6 | (4.7–4.8) | ||
♂ | 89 | 4.7 | 0.6 | (4.6–4.8) | 0.39 | |
♀ | 91 | 4.8 | 0.6 | (4.7–4.9) | ||
Week 10: 2nd measurement; GA (weeks) | 178 | 10.6 | 0.8 | (10.5–10.7) | ||
♂ | 87 | 10.6 | 0.7 | (10.5–10.8) | 0.65 | |
♀ | 91 | 10.7 | 0.9 | (10.5–10.9) | ||
Week 10: 2nd yolk sac diameter (mm) | 178 | 5.9 | 0.9 | (5.8–6.0) | ||
♂ | 87 | 5.9 | 0.8 | (5.7–6.1) | 0.99 | |
♀ | 91 | 5.9 | 1.0 | (5.7–6.1) | ||
Week 7–10: Yolk sac growth rate (mm week−1) | 170 | 0.38 | 0.33 | (0.33–0.43) | ||
♂ | 81 | 0.37 | 0.29 | (0.30–0.43) | 0.67 | |
♀ | 89 | 0.39 | 0.36 | (0.32–0.46) |
