Table 1 Maternal and pregnancy characteristics among the cohort study population
Characteristic | All (n = 113) | DCDA (n = 98) | MCBA (n = 15) | p |
|---|---|---|---|---|
Enrolment | ||||
Median Maternal age, years (IQR) | 34.1 (30.2–37.2) | 34.3 (30.2–37.3) | 32.6 (29.9–35.2) | NS |
Median Gestational age, wks (IQR) | 12.1 (11.6–12.9) | 12.1 (11.6–12.7) | 12.4 (11.6–13.0) | NS |
Median BMI, kg/h2 (IQR) | 24.5 (22.0–28.6) | 24.9 (22.0–29.3) | 23.9 (21.1–26.1) | NS |
Ethnicity n (%) | ||||
Caucasian | 108 (95.6) | 94 (95.9) | 14 (93.3) | NS |
Arab | 5 (4.4) | 4 (4.1) | 1 (6.7) | |
CRL | ||||
Twin 1 | 60.5 (53.0–69.0) | 60.0 (53.0–69.0) | 63.4 (51.9–69.0) | NS |
Twin 2 | 59.9 (51.0–69.3) | 59.0 (51.0–68.0) | 65.8 (50.0–75.0) | NS |
Conception | ||||
Spontaneous | 54 (47.8) | 40 (40.8) | 14 (93.3) | < 0.001 |
In-vitro fertilization | 42 (37.2) | 41 (41.8) | 1 (6.7) | |
Ovulation induction, AID, AIH, ICSI | 17 (15.0) | 17 (17.3) | 0 (0) | |
Nulliparous, n (%) | 44 (38.9) | 39 (39.8) | 5 (33.3) | NS |
Median fetal fraction (IQR) | 14.0 (10.0–17.0) | 13.5 (9.7–16.5) | 16.0 (14.0–17.0) | NS |
Deliverya | ||||
Median Gestational age, wks (IQR) | 36.5 (34.9–37.3) | 36.9 (35.1–37.3) | 34.6 (32.7–36.1) | 0.048 |
Mode of delivery, n (%) | ||||
Spontaneous | 19 (23.5) | 18 (24.7) | 1 (12.5) | NS |
Other | 62 (76.5) | 55 (75.3) | 7 (87.5) | |
The delivery outcome, n (%) | ||||
Two fetuses born | 85 (85.0) | 76 (85.4) | 9 (81.8) | NS |
One fetus born | 10 (10.0) | 10 (11.2) | 0 (0) | |
Loss of entire pregnancy | 5 (5.0) | 3 (3.4) | 2 (18.2) | |
Birth weight | ||||
Twin 1 | 2358 (2025–2645) | 2401 (2075–2695) | 1700 (1400–2540) | NS |
Twin 2 | 2360 (2068–2592) | 2375 (2070–2605) | 2142 (1670–2545) | NS |