Table 1. maternal characteristics by chorionicity and mode of conception.
| MCDA (n = 456) |
DCDA (n = 697) |
|||||
|---|---|---|---|---|---|---|
| ART (n = 29) | SC (n = 427) | P value | ART (n = 382) | SC (n = 315) | P value | |
| Maternal age–yearsa | 32.9 ± 3.5 | 29.2 ± 3.9 | <0.01 | 32.8 ± 3.5 | 30.4 ± 3.7 | <0.01 |
| Body mass index–kg/m2 a | 22.2 ± 3.9 | 20.6 ± 2.9 | 0.01 | 22.5 ± 3.1 | 22.5 ± 3.3 | 0.86 |
| Multigravida–n (%)b | 12 (41.4) | 195 (45.7) | 0.65 | 155 (40.8) | 140 (44.4) | 0.33 |
| Nullipara–n (%)b | 26 (90.0) | 355 (83.1) | 0.36 | 361 (94.5) | 272 (86.3) | <0.01 |
| Women with pre-existing diseases–n (%)b | 4 (13.8) | 35 (8.2) | 0.30 | 25 (6.5) | 33 (10.5) | 0.06 |
| Birth weight–ga | 2169 ± 602 | 2177 ± 523 | 0.91 | 2463 ± 463 | 2478 ± 449 | 0.54 |
ART: assisted reproductive technology; SC: spontaneous conception.
aStudent t test was used to compare continuous variables.
bChi square test was used to analyze categorical variables. Pre-existing diseases included chronic hypertension, diabetes, thyroid disease, heart disease, lupus, asthma, HIV, hepatitis B and psychiatric disorders.