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Table 1 Basic characteristics of the study group

From: Hemoglobin differences in twins are related to the time of cord clamping, not intertwin transfusion – a prospective cohort study

  Study group DCC + DCC DCC + ECC ECC + DCC ECC + ECC p
Mothers
  N = 169 N = 105 N = 12 N = 25 N = 27  
 age (years) 30.7 (27.2–34.1) 29.8 (26.9–33.2) 30.3 (27.1–34.1) 30.1 (27.2–34) 31.1 (27.8–34.1) 0.9
 primiparity 104 (61.5) 66 (62.8) 7 (58.3) 15 (60) 16 (59.3) 0.4
 MC 66 (39.1) 45 (42.9) 4 (33.3) 4 (16) 13 (48.2) 0.01 *
 DC 103 (60.9) 60 (57.1) 8 (66.7) 21 (84) 14 (51.8) 0.01 *
 GH/PE 18 (10.7) 7 (6.7) 1 (8.3) 5 (20) 5 (18.5) 0.05
 GDM 35 (20.7) 16 (15.2) 4 (33.3) 3 (12) 12 (44.4) 0.01 *
 ICP 15 (8.9) 10 (9.5) 1 (8.3) 2 (8) 2 (7.4) 0.8
 PPROM 25 (14.8) 15 (14.3) 2 (16.7) 5 (20) 3 (11.1) 0.4
 Gestational age at delivery (weeks) 36 (31–39) 36 (31–38) 35 (31–38) 36 (31–38) 36 (32–39) 0.8
 PTD 93 (55) 51 (48.6) 10 (83.3) 14 (56) 18 (66.7) 0.03 **
 PTD < 34 wks 5 (3) 0 2 (16.7) 2 (8) 1 (3.7) 0.2
 vaginal delivery 42 (24.9) 24 (22.8) 2 (16.7) 10 (40) 6 (22.2) 0.3
Infants
  N = 338 N = 210 N = 24 N = 50 N = 54  
 MC twins 132 (39.1) 90 (42.9) 8 (33.3) 8 (16) 13 (48.2) 0.01 *
 DC twins 206 (60.9) 120 (57.1) 16 (66.7) 42 (84) 28 (51.8) 0.01 *
 birthweight 1st twin (g) 2575 (2030–2870) 2620 (2180–2910) 2350 (2030–2590) 2640 (2200–2890) 2450 (2080–2670) 0.1
 birthweight 2nd twin (g) 2510 (2000–2820) 2610 (2170–2930) 2200 (1980–2380) 2420 (2010–2740) 2360 (2060–2720) 0.1
 SGA 1st twin 23 (13.6) 12 (11.4) 2 (16.7) 4 (16) 5 (18.5) 0.3
 SGA 2nd twin 19 (11.2) 9 (8.6) 3 (25) 2 (8) 5 (18.5) 0.3
 male twin 175 (51.8) 109 (51.9) 12 (50) 26 (52) 28 (51.9) 0.9
 5th minute Apgar < 8 of 1st twin 8 (4.7) 6 (3.6) 0 0 2 (1.2) 0.2
 5th minute Apgar < 8 of 2nd twin 14 (8.3) 6 (3.6) 2 (1.2) 1 (0.6) 1 (0.6) 0.1
  1. Data are expressed as median (interquartile range) or number (%). p values are presented for the groups with the greatest difference. In small for gestational age infants and Apgar score the percentages are calculated for the number of the 1st and 2nd born twins
  2. * ECC + DCC vs ECC + ECC
  3. ** DCC + DCC vs DCC + ECC
  4. *** DCC + ECC vs ECC + ECC/DCC + ECC vs ECC + DCC
  5. DCC + DCC delayed cord clamping performed in both twins, DCC + ECC delayed cord clamping in the first and early cord clamping in the second twin performed, ECC + DCC early cord clamping in the first and delayed cord clamping in the second twin performed, ECC + ECC early cord clamping performed in both twins, MC monochorionic gestation, DC dichorionic gestation, GH gestational hypertension, PE preeclampsia, GDM gestational diabetes mellitus, ICP intrahepatic cholestasis of pregnancy, PPROM preterm prelabor rupture of membranes, PTD preterm delivery, MC twins monochorionic twins, DC twins dichorionic twins, wks weeks of gestation