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Table 1 Maternal characteristics per groups of age

From: Impact of aging on obstetric outcomes: defining advanced maternal age in Barcelona

  < 30 years n = 2437 30–34 years n = 9643 35–39 years n = 9887 40–44 years n = 2807 ≥45 years n = 280 p
GA at delivery 39.5 ± 1.7 39.5 ± 1.7 39.4 ± 1.7 39.2 ± 1.7 38.6 ± 1.7 < 0,001
Multiparous 7.4%(181) 17.1%(1647) 26.8%(2652) 27.5%(771) 9.3% (26) < 0,001
Previous c-section 1.9%(46) 4.4%(423) 7.2%(707) 8.8%(247) 6.1% (17) < 0,001
Chronic hypertension 0.4% (10) 0.4% (38) 0.4% (37) 0.8% (22) 3.6% (10) < 0,001
Pregestational diabetes 0.6% (15) 0.7%(65) 0.6%(63) 1.0% (29) 0,115
Thrombophilias 0.5% (12) 0.6%(61) 1.3%(126) 1.7%(48) 2.9% (8) < 0,001
ART 1.5% (36) 3.5%(341) 6.9%(683) 17.2%(484) 77.5%(217) < 0,001
Smoking 13.7%(285) 9.6%(828) 8.4%(756) 9.5%(238) 8.6% (22) < 0,001
Obesity 6.0%(147) 4.3%(418) 4.7%(468) 5.9%(167) 6.4% (18) < 0,001
  1. Comparison between maternal characteristics per groups of age. Results are shown as mean ± SD for continuous variables, and % (n) for categorical variables. P value was obtained with Chi-square test for categorical variables and T-test for continous variables. P < 0.05 was considered significant. N number of. GA gestational age at delivery. ART assited reproductive techniques. P p value