Table 1 Pregnancy duration according to fetal size at 10–24 weeks of gestation.
HC | AC | FL | ||||
|---|---|---|---|---|---|---|
z-score | Pregnancy duration (days) | 95% CI | Pregnancy duration (days) | 95% CI | Pregnancy duration (days) | 95% CI |
Unadjusted results | ||||||
-2.5 | 289.6 | 288.0, 291.1 | 289.0 | 287.4, 290.6 | 288.3 | 286.6, 289.9 |
-2.0 | 288.5 | 287.1, 289.8 | 288.0 | 286.6, 289.4 | 287.4 | 286.0, 288.8 |
-1.5 | 287.3 | 286.2, 288.4 | 287.0 | 285.8, 288.1 | 286.5 | 285.3, 287.6 |
-1.0 | 286.1 | 285.2, 287.0 | 285.9 | 284.9, 286.8 | 285.6 | 284.6, 286.5 |
-0.5 | 284.9 | 284.1, 285.6 | 284.7 | 284.0, 285.5 | 284.6 | 283.8, 285.3 |
0.0 | 283.6 | 282.8, 284.2 | 283.5 | 282.8, 284.2 | 283.6 | 282.8, 284.3 |
0.5 | 282.2 | 281.4, 283.0 | 282.3 | 281.5, 283.1 | 282.5 | 281.7, 283.3 |
1.0 | 280.8 | 279.7, 281.8 | 281.1 | 280.0, 282.1 | 281.4 | 280.3, 282.5 |
1.5 | 279.3 | 277.8, 280.7 | 279.7 | 278.3, 281.1 | 280.3 | 278.9, 281.7 |
2.0 | 277.7 | 275.8, 279.5 | 278.3 | 276.4, 280.1 | 279.1 | 277.3, 280.9 |
2.5 | 276.1 | 273.6, 278.4 | 276.9 | 274.4, 279.2 | 277.9 | 275.6, 280.1 |
P-value† | <0.0001 | <0.0001 | <0.0001 | |||
Adjusted for the difference between LMP- and HC-based gestational ages. | ||||||
-2.5 | 286.9 | 282.9, 290.4 | 286.6 | 284.5, 288.6 | 286.0 | 284.1, 287.8 |
-2.0 | 286.3 | 283.0, 289.2 | 286.0 | 284.2, 287.7 | 285.5 | 283.9, 287.1 |
-1.5 | 285.6 | 283.1, 287.9 | 285.4 | 284.0, 286.8 | 285.1 | 283.8, 286.3 |
-1.0 | 284.9 | 283.2, 286.6 | 284.8 | 283.7, 285.8 | 284.6 | 283.5, 285.5 |
-0.5 | 284.2 | 283.2, 285.3 | 284.2 | 283.4, 285.0 | 284.1 | 283.3, 284.8 |
0.0 | 283.5 | 282.8, 284.2 | 283.5 | 282.8, 284.2 | 283.5 | 282.8, 284.2 |
0.5 | 282.8 | 281.7, 283.9 | 282.9 | 282.0, 283.7 | 283.0 | 282.2, 283.8 |
1.0 | 282.1 | 280.2, 283.9 | 282.2 | 281.1, 283.4 | 282.5 | 281.4, 283.5 |
1.5 | 281.3 | 278.5, 284.0 | 281.6 | 280.0, 283.1 | 282.0 | 280.5, 283.3 |
2.0 | 280.6 | 276.6, 284.0 | 280.9 | 278.8, 282.8 | 281.4 | 279.6, 283.2 |
2.5 | 279.8 | 274.7, 284.1 | 280.2 | 277.5, 282.6 | 280.9 | 278.6, 283.0 |
P-value† | 0.089 | 0.004 | 0.008 | |||