Table 1 Sample characteristics.

From: Reduced apparent fiber density in the white matter of premature-born adults

 

VP/VLBW (n = 73)

FT (n = 89)

p value

M

SD

Range

M

SD

Range

Sex(male/female)

44/29

  

53/36

  

0.93

Age (years)

26.8

 ± 0.6

25.8–28.0

26.8

 ± 0.8

25.6–28.9

0.54

GA (weeks)

30.4

 ± 2.1

25–36

39.7

 ± 1.0

37–42

 < 0.001

BW (g)

1305

 ± 311

630–2070

3372

 ± 468

2120–4670

 < 0.001

OPTI neonatal

9.1

 ± 2.6

3–14

0.4

 ± 0.7

0–3

 < 0.001

SESa (a.u.)

19/33/21

 

1–3

28/41/20

 

1–3

0.59

Maternal age (years)

29.3

 ± 4.9

16–38

29.3

 ± 5.0

18–42

0.66

Full-scale IQ (a.u.)

93.9

 ± 11.8

64–125

102.9

 ± 12.4

77–130

 < 0.001

  1. Statistical comparisons: Sex, SES with χ2 statistics; age, FS-IQ with two sample t-tests; GA, BW, maternal age with Mann–Whitney-U tests.
  2. BW birth weight, FT full-term, GA gestational age, IQ intelligence quotient, M mean, maternal age maternal age at birth, OPTI standardized optimality scoring system, SD standard deviation, SES socioeconomic status at birth, VP/VLBW very preterm and/or very low birthweight.
  3. a1 = upper class, 2 = middle class, 3 = lower class.
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