Gestational age (the earliest in case of repeated US exams)—categories | P | |||
First trimester (8 - 14 weeks) | Second trimester | Third trimester | ||
N (%) | N (%) | N (%) | ||
Any positive visible fetal abnormality detected by US | <0.001 | |||
Negative (no abnormality noticed) | 473 (97.1) | 992 (90.5) | 454 (88.3) | |
Positive (abnormal) | 14 (2.9) | 104 (9.5) | 60 (11.7) | |
Total | 487 (100) | 1096 (100) | 514 (100) |