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Table 1 Demographic characteristics and birth outcomes

From: Early exposure to environment sounds and the development of cortical auditory evoked potentials of preterm infants during the first 3 months of life

 Total sample, N = 23Preterm, n = 12Term, n = 11p value
n (%)
Maternal agea
 < 34 (y. o.)b8 (66.67)2 (66.67)6 (66.67)> 0.05
 > 35 (y. o.)4 (33.33)1 (33.33)3 (33.33)
Education
 Less than middle-school17 (94.44)8 (100.00)9 (90.00)> 0.05
 More than middle-schoolc1 (5.56)0 (0.00)1 (10.00)
Sex of child
 Male10 (43.48)6 (46.16)4 (40.00)> 0.05
 Female13 (56.52)7 (53.84)6 (60.00)
Gestational age
 31 to < 37 weeks13 (56.52)13 (100.0)0 (0.00)< 0.05
 > 37 weeks10 (43.48)0 (0.00)10 (100.0)
Birth weighte
 < 2500 g10 (50.00)10 (83.33)0 (0.00)< 0.05
 > 2500 g10 (50.00)2 (16.67)8 (100.00)
Family income (in minimum wages)f
 < 18 (50.00)3 (42.85)5 (55.55)> 0.05
 1 to 58 (50.00)4 (57.15)4 (44.45)
Socioeconomic statusg,h
 A, B, and C6 (30.00)1 (9.10)5 (55.55)< 0.05
 D and E14 (70.00)10 (90.90)4 (44.45)
NICU admissioni
 No6 (42.85)3 (50.00)3 (37.50)> 0.05
 Yesj8 (57.15)3 (50.00)5 (62.50)
  1. a11 missing values
  2. by.o.: years old
  3. c5 missing values
  4. d31.28 weeks
  5. e3 missing values
  6. f8 missing values
  7. g3 missing values
  8. hBrazil Economic Classification Criteria (https://www.abep.org/criterio-brasil)
  9. i9 missing values; jAll infants stayed in NICU for 2 days