Table 2.
Total placental weight in intrauterine growth restriction (IUGR) and non-IUGR (nIUGR) monochorionic and dichorionic twins as a function of gestational age (GA) at birth.
| Median total birth weight in grams (range) | Median total placental weight in grams (range) (number of cases) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| GA at Birth (wks) | Monochorionic, N=105 | Dichorionic, N=219 | Monochorionic, N=105 | Dichorionic, N=219 | ||||||
| IUGR (n=40) | nIUGR (n=65) | IUGR (n=57) | nIUGR (n=162) | IUGR (n=40) | nIUGR (n=65) | p | IUGR (n=57) | nIUGR (n=162) | p | |
| ≤28 | - | 1965 (1850-3053) | - | 1620 (1280-2440) | (0) | 415 (330-575) (6) | - | (0) | 395 (185-617) (8) | - |
| 29–31 | 2390 (2220-2560) | 2936 (2370-3394) | 2040 (1770-2360) | 2810 (2370-3600) | 530 (520-540) (2) | 529 (465-730) (7) | 0.99* | 335 (230-500) (3) | 542 (365-710) (14) | 0.03* |
| 32–34 | 3185 (1970-3920) | 3845 (2950-4820) | 3320 (2640-4120) | 3980 (3090-5280) | 494.35 (340-690) (16) | 650 (540-820) (16) | <0.001* | 603 (420-960) (13) | 684 (475-1035) (22) | 0.20* |
| ≥35 | 3990 (3010-4670) | 4819 (3840-5950) | 4350 (3260-5200) | 5280 (3880-6570) | 692.5 (505-830) (22) | 696 (450-990) (36) | 0.25* | 645 (450-1130) (41) | 807.5 (505-1340) (118) | <0.001* |
| All (24-38) | 3650 (1970-4670) | 4400 (1850-5950) | 4180 (1770-5200) | 5035 (1280-6570) | 627.5 (340-830) (40) | 665 (330-990) (65) | 0.02** | 620 (230-1130) (57) | 765 (185-1340) (162) | <0.001** |
Wks, weeks;
*
Mann-Whitney U test;
**
Student’s t test.