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 |