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Table 1 Perinatal and socio-demographic characteristics of the overall sample

From: Effect of medically assisted reproduction (MAR) and pregnancy planning on Bayley-III Screening Test subscales in preterm infants at 12 months of corrected age: a cross-sectional study

Perinatal data
Gestational age (weeks), n (%)
 very early (< 28 weeks) 20/171 (11.69)
 early (28–31 weeks) 29/171 (16.95)
 moderate (32–33 weeks) 42/171 (24.56)
 late (34–36 weeks) 80/171 (46.78)
Birth weight (g), n (%)
 Not LBW (> 2500 g) 0/171 (0)
 LBW (1500–2499 g) 108/171 (63.15)
 VLBW (1000–1499 g) 38/171 (22.22)
 ELBW (< 1000 g) 25/171 (14.61)
Mode of delivery, n (%)
 Sectio caesarea 118/171 (69.00)
 Per vias naturales 51/171 (29.82)
Apgar scores, M ± SD
 1 min 7.67 ± 1.62
 5 min 8.80 ± 1.09
 10 min 9.27 ± 0.73
Intensive care, n (%)
 NICU-admission 143/171 (83.62)
 Sub-intensive care 19/171 (11.11)
Chronic neonatal morbidities, n (%)
 BPD (bronchopulmonary dysplasia) 12/171 (7.01)
 ROP (retinopathy of prematurity) 6/171 (3.50)
 IVH (intraventricular haemorrhage) 5/171 (2.92)
 NEC (necrotizing enterocolitis) 1/171 (0.58)
 PDA (patent ductus arteriosus) 12/171 (7.01)
 ASD (atrial septal defect) 2/171 (1.16)
 VSD (ventricular septal defect) 2/171 (1.16)
Socio-demographic data
Maternal age at childbirth (years), M ± SD 30.79 ± 6.11
Maternal education, n (%)
 Primary 24/171 (14.03)
 Secondary technical education 25/171 (14.61)
 Secondary vocational education 26/171 (15.20)
 Secondary grammar education 19/171 (11.11)
 College 38/171 (22.22)
 University 33/171 (19.29)
Marital status, n (%)
 Single 9/171 (5.26)
 Married 105/171 (61.40)
 Cohabiting 39/171 (22.80)
 In a relationship 11/171 (6.43)
Social status, n (%)
 Above-average 68/171 (39.76)
 Average 76/171 (44.44)
 Below-average 17/171 (9.94)