## 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
later^{a)} |
|||||||

Consented (n = 617) |
Did not consent (n = 409) |
||||||

Variable |
n |
n |
p |
||||

Gender: boys, n (%) |
617 | 296 | (48.0) | 408 | 220 | (53.9) | 0.065^{b)} |

Preeclampsia, n (%) |
617 | 230 | (37.3) | 409 | 137 | (33.5) | 0.231^{b)} |

Maternal age, years, mean, 95% CI |
610 | 28.0 | (27.7, 28.4) | 408 | 27.6 | (27.2, 28.1) | 0.194^{c)} |

Gestational age, weeks; mean, 95% CI |
604 | 39.3 | (39.1, 39.5) | 343 | 39.2 | (39.0, 39.5) | 0.855^{c)} |

Birth weight z-score^{d)} |
590 | -0.17 | (-0.27, -0.07) | 339 | -0.06 | (-0.18, 0.06) | 0.169^{c)} |

*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