Table 1

Perinatal, maternal and adult phenotypic characteristics of the female MZ twins discordant for birth weight

Characteristic

Heavier co-twins

Lighter co-twins

Range

Pa

N

17

17


Perinatal

  Gestational age (weeks)b

37.9 ± 2.4

37.9 ± 2.4

(34-42)

  Birth weight (g)

2,619 ± 319

1,921 ± 278

(1,440-3,100)

<0.0001

  Umbilical cord insertionb

    (Para)central

12 (75%)

4 (25%)

    (Para)marginal

4 (25%)

9 (56%)

    Velamentous

0 (0%)

3 (19%)

0.008

Maternal

  Maternal age (years)

26.9 ± 5.4

26.9 ± 5.4

(18-43)

  Parity

1.8 ± 1.0

1.8 ± 1.0

(1-4)

Adult

  Age (years)

34.4 ± 7.1

34.4 ± 7.1

(22-45)

  Body height (cm)

166.9 ± 6.1

165.5 ± 6.7

(155-177)

0.13

  Body weight (kg)

62.7 ± 12.3

61.2 ± 14.2

(47.5-102)

0.18

  Body mass index (kg/m2)

22.5 ± 3.8

22.3 ± 4.5

(16.7-33.7)

0.60


Continuous data expressed as mean ± standard deviation. Categorical data expressed as number of observations (%). aHeavy versus light calculated using a paired t-test for continuous data and Fisher's exact test for categorical data. bMissing for one twin pair.

Souren et al. Genome Biology 2013 14:R44   doi:10.1186/gb-2013-14-5-r44

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