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In vitro fertilisation and use of ovulation enhancers may both influence childhood height in very low birthweight infants
  1. I R Makhoul1,10,
  2. A Tamir10,
  3. D Bader2,10,
  4. A Rotschild3,10,
  5. Z Weintraub4,10,
  6. S Yurman5,10,
  7. D Reich6,10,
  8. Y Bental7,10,
  9. J Jammalieh8,
  10. T Smolkin1,10,
  11. P Sujov1,10,
  12. Z Hochberg9,10
  1. 1
    Department of Neonatology, Rambam Health Care Campus, Haifa, Israel
  2. 2
    Department of Neonatology, Bnei Zion Medical Center, Haifa, Israel
  3. 3
    Department of Neonatology, Carmel Medical Center, Haifa, Israel
  4. 4
    Department of Neonatology, Western Galilee Medical Center, Nahariya, Israel
  5. 5
    Department of Neonatology, Hillel Yafe Medical Center, Hadera, Israel
  6. 6
    Department of Neonatology, Haemek Medical Center, Afula, Israel
  7. 7
    Department of Neonatology, Laniado Hospital, Netanya, Israel
  8. 8
    Department of Neonatology, French Hospital, Nazareth, Israel
  9. 9
    Department of Pediatric Endocrinology, Meyer Children’s Hospital, Rambam Health Care Campus, Haifa, Israel
  10. 10
    Rappaport Faculty of Medicine, Technion – Israel Institute of Technology, Haifa, Israel
  1. Correspondence to Dr Imad R Makhoul, Department of Neonatology, Rambam Medical Center, Bat-Galim, Haifa 31096, Israel; makhoul{at}rambam.health.gov.il

Abstract

Context: Term-born children conceived by in vitro fertilisation (IVF) are reportedly taller than naturally conceived (NC) children. High levels of growth promoting hormones and epigenetic imprinting have been suggested as pathogenetic mechanisms.

Hypothesis: Tall stature in prematurely born IVF-conceived (IVF-C) children suggests pre- or early implantation imprinting rather than a postnatal effect.

Methods: We studied 334 very low birthweight (VLBW: birth weight <1500 g) children born prematurely during 1995–1999 and obtained their anthropometric measures at 6–10 years of age. Perinatal and neonatal data were obtained from the Israeli VLBW database. We compared IVF-C, ovulating agents conceived (OA-C) and naturally conceived (NC) groups of children with respect to their and their parents’ anthropometry and their perinatal/neonatal variables.

Results: Childhood height standard deviation scores (SDSs) were greatest in IVF-C (−0.12 (SD 1.25); p<0.022) and insignificantly greater in OA-C (−0.37 (SD 1.02)) as compared to NC (−0.58 (SD 1.36)) children. The IVF-C and NC groups were significantly different regarding 17 parental and perinatal variables; however, multiple regression analysis including these variables showed that, as compared with NC, IVF-C children had significantly older mothers at birth with earlier follow-up during pregnancy and more multi-fetal pregnancies.

Conclusions: IVF-C and to a lesser extent OA-C prematurely born children are taller than otherwise NC children. After ruling out postnatal and parental causes, we speculate that pre- or early implantation factors might have contributed to the taller stature of IVF-C children.

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Footnotes

  • Competing interests None.

  • Ethics approval The Helsinki Committees at the eight participating medical centres in Northern Israel approved this study.

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