Table 4.
Follow-up second and third trimester ultrasound visit schedule for singleton and twin pregnancies by randomization group
| Singleton | |||||
| Group (N) | Targeted gestational week for ultrasound examination | ||||
| A (581) | 16 (15 to 17) | 24 (23 to 25) | 30 (29 to 31) | 34 (33 to 35) | 38 (37 to 39) |
| B (582) | 18 (17 to 19) | 26 (25 to 27) | 31 (30 to 32) | 35 (34 to 36) | 39 (38 to 40) |
| C (581) | 20 (19 to 21) | 28 (27 to 29) | 32 (31 to 33) | 36 (35 to 37) | 40 (39 to 41) |
| D (590) | 22 (21 to 23) | 29 (28 to 30) | 33 (32 to 34) | 37 (36 to 38) | 41 (40 to 42) |
| Twin | ||||||
| Group (N) | Targeted gestational week for ultrasound examination | |||||
| A (84) | 16 (15 to 17) | 20 (19 to 21) | 24 (23 to 25) | 28 (27 to 29) | 32 (31 to 33) | 35 (34 to 36) |
| B (87) | 18 (17 to 19) | 22 (21 to 23) | 26 (25 to 27) | 30 (29 to 31) | 34 (33 to 35) | 36 (35 to 37) |