Table 1.
Patient characteristics
| Variable | All patients (n = 30) | By progression to higher stage TTTS | ||
|---|---|---|---|---|
| No progression (n = 22) | Progression (n = 8) | p-Value | ||
| Maternal age, ya | 30 (10.0) | 30 (10.0) | 30.5 (10.0) | 0.87 |
| Nulliparity, n (%)b | 14 (46.7) | 12 (54.6) | 2 (25.0) | 0.23 |
| GA at diagnosis, wka | 20.8 (3.7) | 21.4 (3.4) | 18.9 (2.9) | 0.06 |
| GA at delivery, wka | 31.4 (7.2) | 33.9 (4.9) | 27.7 (5.8) | 0.04 |
| Mode of deliveryb | 0.09 | |||
| SVD, n (%) | 9 (30.0) | 5 (22.7) | 4 (50.0) | |
| C section, n (%) | 20 (64.3) | 17 (77.3) | 3 (37.5) | |
| Elective termination, n (%) | 1 (3.3) | 0 (0.0) | 1 (12.5) | |
Abbreviations: GA, gestational age; SVD, spontaneous vaginal delivery; TTTS, twin–twin transfusion syndrome.
Note: N values represent number of pregnancies. Stage I TTTS groups with and without progression to higher stage TTTS are the comparison groups for the p-values. Wilcoxon Rank Sum and Fisher exact tests were used to compare nonparametric continuous variables and proportions, respectively. A significance level of 0.05 was used to define significance for these analyses.
a
Results for continuous variables are displayed as median (interquartile range).
b
Results for proportions are displayed as n (percentage).