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Table 1 Characteristics of the study population categorised by age group

From: Maternal age and the risk of adverse pregnancy outcomes: a retrospective cohort study

  < 17 years (71) 18–28 years (5714) 29–39 years (15591) > 40 years (1552) p
Maternal age (years) 16.52 (±0.63) 24.86 (±2.70) 33.59 (±2.89) 41.34 (±1.60) 1,2,3,4,5,6
Nulliparous women 98.55% (68/69) 69.84% (3858/5524) 52.31% (7897/15097) 38.22% (571/1494) 1,2,3,4,5,6
Low schooling 76.06% (54/71) 34.06% (1946/5714) 18.27% (2848/15591) 20.30% (315/1552) 1,2,3,4,5,6
Conception mode
 Spontaneous 98.59% (70/71) 99.46% (5683/5714) 98.40% (15342/15591) 96.13% (1492/1552) 4,5,6
 Ovulation induction/IUI 1.41% (1/71) 0.35% (20/5714) 0.59% (92/15591) 0.52% (8/1552) 4
 IVF/ICSI 0.00% (0/71) 0.19% (11/5714) 1.01% (157/15591) 3.35% (52/1552) 4,5,6
Gestational age at delivery (weeks) 38.80 (±2.56) 38.69 (±2.64) 38.61 (±2.50) 38.17 (±2.68) 3,4,5,6
 Delivery < 32 weeks 2.82% (2/71) 3.65% (208/5705) 3.02% (470/15547) 3.80% (59/1552) 4
 Delivery < 34 weeks 2.82% (2/71) 4.93% (281/5705) 4.55% (707/15547) 5.86% (91/1552) 6
 Delivery < 37 weeks 8.45% (6/71) 9.87% (563/5705) 9.90% (1539/15547) 13.92% (216/1552) 5,6
Macro-region of origin
 Europe/Italy 80.00% (56/70) 81.29% (4637/5704) 92.03% (14339/15581) 94.71% (1469/1551) 2,3,4,5,6
 Sub-Saharian Africa 12.86% (9/70) 6.54% (373/5704) 3.61% (562/15581) 2.45% (38/1551) 1,2,3,4,5,6
 Arabian countries 1.43% (1/70) 5.84% (333/5704) 1.93% (301/15581) 1.42% (22/1551) 4,5
 Other origin 5.71% (4/70) 6.33% (361/5704) 2.43% (379/15581) 1.42% (22/1551) 3,4,5,6
PRHDs 0.00% (0/71) 2.22% (127/5714) 2.51% (391/15591) 5.41% (84/1552) 3,5,6
GDM 0.00% (0/71) 2.54% (145/5714) 4.28% (667/15591) 6.44% (100/1552) 3,4,5,6
  1. Acronyms: IUI Intrauterine insemination, IVF In vitro fertilization, ICSI Intracytoplasmatic sperm injection, PRHD Pregnancy related hypertensive disorder, GDM Gestational diabetes mellitus. Different numbers indicate statistically significant differences (p < 0.05): (1) < 17 years vs 18–28 years; (2) < 17 years vs 29–39 years; (3) < 17 years vs > 40 years; (4) 18–28 years vs 29–39 years; (5) 18–28 years vs > 40 years; (6) 29–39 years vs > 40 years. NS= no significant difference