Table 1 Sociodemographic and other characteristics of the participants (N = 297)

Actual age (in years)

15.57 ± 1.64

Gestational age (in weeks)

37.63 ± 2.74

Birth weight (in grams)

3032.08 ± 725.44

Birth length (in cm)

46.82 ± 4.98

Father’s age at birth (in years)

35.87 ± 4.89

Mother’s age at birth (in years)

30.42 ± 4.82

Mother’s age at menarche (in years)

12.44 ± 1.29

Girls’ age at menarche (in years)

12.39 ± 1.39

Days of menstruation in girls

4.95 ± 1.10

Parity

1.91 ± 1.02

Apgar at 1 min

8.52 ± 1.43

Apgar at 5 min

9.56 ± 1.32

Actual Body Mass Index (in kg/m²)

21.31 ± 3.19

Days of phototherapy

1.01 ± 2.19

Delivery mode

 Vaginal

143 (48.3%)

 Cesarean

153 (51.7%)

Admission to the NICU (yes)

96 (32.4%)

Small for gestational age (yes)

19 (6.4%)

Prematurity (yes)

62 (20.9%)

Breastfeeding (yes)

217 (73.3%)

Neonatal infection (yes)

54 (18.2%)

Maternal smoking during pregnancy (yes)

14 (4.7%)

Maternal smoking after pregnancy (yes)

79 (26.7%)

Preeclampsia (yes)

7 (2.4%)

Administration of glucocorticoids to the mother (yes)

25 (8.4%)

Administration of glucocorticoids to the newborn (yes)

2 (0.7%)

Ventilation

 No

270 (91.2%)

 HOOD

9 (3.0%)

 Synchronized Intermittent Mandatory Ventilation (SIMV)

17 (5.7%)

Administration of surfactant (yes)

4 (1.4%)

Anemia (yes)

19 (6.4%)

Hirsutism

 No

111 (37.5%)

 Light

155 (52.4%)

 Moderated

30 (10.1%)

Family history of prematurity (yes)

20 (6.8%)

Asthma during childhood (yes)

42 (14.2%)

Polycistic ovary syndrome (PCOS)

15 (5.1%)

Intake of oral contraceptives (yes)

9 (3.0%)

Problems in the regularity of the girl’s period (yes)

70 (23.6%)

Need to change pads during the night (yes)

22 (7.4%)

Presence of big clots during the bleeding (yes)

8 (2.7%)