Mortality from infancy to adolescence in singleton children conceived from assisted reproductive techniques versus naturally conceived singletons in Sweden

Conception through in vitro fertilization–intracytoplasmic sperm injection, especially using cryopreserved embryos, was associated with higher infant mortality in singleton children, predominantly during the first week of life.

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Volume 113, Issue 3, Pages 524–532

Authors:

Kenny A. Rodriguez-Wallberg, M.D., Ph.D., Frida E. Lundberg, Ph.D., Sara Ekberg, Ph.D., Anna L.V. Johansson, Ph.D., Jonas F. Ludvigsson, M.D., Ph.D., Catarina Almqvist, M.D., Ph.D., Sven Cnattingius, M.D., Ph.D., Anastasia N. Iliadou, Ph.D.

Abstract:

Objective

To assess infant (<1 year) and childhood (1–18 years) mortality in singletons conceived through assisted reproductive techniques (ART) versus naturally conceived singletons.

Design

Nationwide prospective study.

Setting

Sweden.

Patient(s)

All singleton liveborn infants born from 1983 to 2012 in Sweden identified using the Medical Birth Register (N = 2,847,108), of whom 43,506 were conceived through ART treatments including in vitro fertilization with and without intracytoplasmic sperm injection.

Intervention(s)

None.

Main Outcome Measures(s)

Infant (<1 year) and childhood (1–18 years) mortality.

Result(s)

Data on ART treatment and covariates were retrieved from population-based registers using the unique personal identity number assigned to all permanent residents in Sweden. Cox proportional hazards models estimated the hazard ratios (HRs) with 95% confidence intervals (CIs) as measures of association between ART treatments and death. The analyses were adjusted for maternal characteristics, infertility, child sex, and birth cohort and were restricted to individuals with complete information on covariates for fully adjusted analysis. Compared with naturally conceived singletons, higher infant mortality risks were seen in infants conceived through ART (adjusted HR 1.45; 95% CI, 1.19–1.77), especially after transfer of cryopreserved embryos (adjusted HR 2.30; 95% CI, 1.46–3.64). Early neonatal mortality risk (deaths during the first week) was increased in children born after transfer of blastocysts (HR 2.40; 95% CI, 1.05–5.48). No increased mortality risk was observed between the ages of 1 and 18 years.

Conclusion(s)

Singletons conceived through ART had an increased risk of infant mortality from birth up to 1 year of life, predominantly in the early neonatal period and in pregnancies after transfer of frozen and thawed embryos.


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Fertility and Sterility

Editorial Office, American Society for Reproductive Medicine

Fertility and Sterility® is an international journal for obstetricians, gynecologists, reproductive endocrinologists, urologists, basic scientists and others who treat and investigate problems of infertility and human reproductive disorders. The journal publishes juried original scientific articles in clinical and laboratory research relevant to reproductive endocrinology, urology, andrology, physiology, immunology, genetics, contraception, and menopause. Fertility and Sterility® encourages and supports meaningful basic and clinical research, and facilitates and promotes excellence in professional education, in the field of reproductive medicine.

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