Table a1 Mother and newborn characteristics by maternal age (twin births, British Columbia (2001 to 2003))
From: Effect of older maternal age on birth outcomes in twin pregnancies: a population-based study
Maternal age (years) 25 to 34 | >35 | P-value | |
|---|---|---|---|
N=666 | N=317 | ||
Parity | 0.25 | ||
Para 1 | 304 (45.6) | 128 (40.4) | |
Para 2 | 238 (35.7) | 129 (38.2) | |
Para 3+ | 124 (18.6) | 60 (18.9) | |
Single parent | 18 (2.8) | 7 (2.3) | 0.67 |
Suboptimal prenatal care (less than four visits) | 34 (5.8) | 9 (2.3) | 0.06 |
Smoking during pregnancy | 62 (9.3) | 22 (6.9) | 0.21 |
Alcohol use during pregnancy | —a | —a | 0.95 |
Drug use during pregnancy | 6 (0.9) | 6 (1.9) | 0.18 |
Prior stillbirth or neonatal death | 9 (1.3) | 10 (3.2) | 0.05 |
Prior low birth weight or preterm birth | 40 (6.0) | 19 (6.0) | 0.99 |
Prior induced abortions (any) | 104 (15.6) | 48 (15.3) | 0.89 |
Prior spontaneous abortion (any) | 140 (21.1) | 96 (30.6) | <0.01 |
Rural residence (<10 000 residents) | 56 (8.4) | 25 (7.9) | 0.78 |
Low SES neighborhood areab | 107 (16.1) | 43 (13.6) | 0.31 |
Aboriginal status | 21 (3.1) | 7 (2.2) | 0.40 |
Prepregnancy weight >70 kg | 142/526 (27.6) | 52/251 (20.7) | 0.06 |
Any congenital anomaly (ICD9 740-759) | 108/1332 (8.1) | 47/634 (7.4) | 0.59 |
Newborn's male gender | 677/1330 (50.9) | 320/634 (50.5) | 0.86 |
