Table 2 Pregnancy outcomes
From: Autoimmune disorders but not heparin are associated with cell-free fetal DNA test failure
|  | Cases n = 58 (%) | Controls n = 295 (%) | p-value |
|---|---|---|---|
Complications of pregnancy | |||
 Pre-eclampsia | 8 (13.8) | 3 (1.0) | < 0.001 |
 IUGR < 5th percentile | 6 (10.3) | 8 (2.7) | < 0.001 |
 Fetal death | 2 (3.4) | 0 |  |
 Othera | 11 (19.0) | 78 (26.4) | 0.3 |
Infant | |||
 Weeks of gestation at birth | 37.2 (36.6–40) | 38 (38.4–40.4) | 0.36 |
 Weight (in grams) | 2856 (2423–3566) | 3139 (2900–3552) | 0.02 |
 Size | 48.9 (47.3–52) | 48.9 (48–50) | 0.96 |
 Fetal malformation | 2 (3.4) | 4 (1.4) | 0.26 |