# Table 1 Characteristics of twin-twin transfusion syndrome (TTTS) patients with and without transient donor hydrops (TDH) after laser therapy: data are expressed as mean ± standard deviation, median [inter-quartile range] and frequency (%)

With TDH after laser therapy (n = 24) Without TDH after laser therapy (n = 118) p
Maternal age at laser therapy (year-old) 33.2 ± 5.1 31.4 ± 4.2 0.077*
Gestational age at operation (weeks) 20.7 ± 2.9 20.8 ± 2.6 0.89*
Amniotic fluid maximum vertical pocket (cm) of recipient twin 12.0 [6] 10.8 [3.69] 0.51#
Gestational age at delivery (weeks) 34.0 [6.0] 34.4 [5.1] 0.93#
Birth weight of liveborn recipients(g) 2180 [1312] 2010 [775] 0.97#
Birth weight of liveborn donors (g) 1955 [1330] 1635 [865] 0.20#
Severe Quintero stage (stage III and IV TTTS) 66.6% (16/24) 42.4% (50/118) 0.030※
Interval form laser therapy to delivery (days) 88 [57] 9 [40] 0.51#
Intertwin EFWD (%) 17.4 ± 12.8 24.7 ± 16.9 0.046*
Intertwin BWD (%) − 0.6 [16.2] (n = 15) 16.5 [21.5] (n = 71) < 0.001#
Donor survival 79.2% (19/24) 68.6% (81/118) 0.34※
Recipient survival 75.0% (18/24) 78.8% (93/118) 0.79※
Two fetuses survival rate 62.5% (15/24) 60.2% (71/118) 0.82※
Total survival 77.1% (37/48) 72.9% (172/236) 0.60※
1. *: Student t test
2. #: Mann-Whitney U test
3. ※: Chi-square or Fisher’s exact test
4. EFWD: Estimated fetal weight discordance
5. BWD: birth weight discordance
6. EFWD was calculated as “((estimated fetal weight of recipient-estimated fetal weight of donor)/estimated fetal weight of recipient) X 100%)”
7. BWD was calculated as “((birth weight of recipient- birth weight weight of donor)/birth weight of recipient) X 100%)”