Table 1

Initial characteristics of 1025 Norwegian children born in 1993–1995 and invited to the Stavanger study according to consenting or not to the first follow-up 11–12 years latera)
Consented (n = 617) Did not consent (n = 409)
Variable n n p
Gender: boys, n (%) 617 296 (48.0) 408 220 (53.9) 0.065b)
Preeclampsia, n (%) 617 230 (37.3) 409 137 (33.5) 0.231b)
Maternal age, years, mean, 95% CI 610 28.0 (27.7, 28.4) 408 27.6 (27.2, 28.1) 0.194c)
Gestational age, weeks; mean, 95% CI 604 39.3 (39.1, 39.5) 343 39.2 (39.0, 39.5) 0.855c)
Birth weight z-scored) 590 -0.17 (-0.27, -0.07) 339 -0.06 (-0.18, 0.06) 0.169c)

Abbreviations:CI confidence interval.

a)Follow-up at the ages of 10.8 years (girls) and 11.8 years (boys);

b)Exact chi-square test;

c)Gosset’s t-test;

d)Number of standard deviations from mean.

Byberg et al.

Byberg et al. BMC Pediatrics 2014 14:101   doi:10.1186/1471-2431-14-101

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