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Keywords:

  • confounders;
  • handedness;
  • prenatal ultrasound;
  • randomized trial

Abstract

Objectives

To determine whether exposure to prenatal ultrasound increases non-right-handedness in boys.

Methods

The association between exposure to prenatal ultrasound and handedness was tested, using logistic regression analysis, in the Helsinki Ultrasound Trial data. We applied an intention-to-treat approach in this analysis of a subset of 4150 subjects whose parents answered a follow-up questionnaire on handedness when the children were aged 13–15 years.

Results

The odds ratio for non-right-handedness of children who had been exposed to prenatal ultrasound was 1.16 (0.98–1.37) for all subjects, 1.12 (0.89–1.41) for boys and 1.24 (0.97–1.58) for girls.

Conclusions

We could not confirm the hypothesis that prenatal ultrasound exposure and handedness are associated. Our findings were independent of the particular definition of handedness used, whether it was considered according to the writing hand alone or defined using a laterality quotient. Copyright © 2011 ISUOG. Published by John Wiley & Sons, Ltd.