The cognitive cost of being a twin: evidence from comparisons within families in the Aberdeen children of the 1950s cohort study.

@article{Ronalds2005TheCC,
  title={The cognitive cost of being a twin: evidence from comparisons within families in the Aberdeen children of the 1950s cohort study.},
  author={Georgina A Ronalds and Bianca L De Stavola and David A Leon},
  journal={BMJ},
  year={2005},
  volume={331 7528},
  pages={
          1306
        }
}
OBJECTIVES To determine whether twins have lower IQ scores in childhood than singletons in the same family and, if so, whether differences in fetal growth explain this deficit. DESIGN Cohort study. SETTING Scotland. PARTICIPANTS 9832 singletons and 236 twins born in Aberdeen between 1950 and 1956. RESULTS At age 7, the mean IQ score of twins was 5.3 points lower (95% confidence interval 1.5 to 9.1) and at age 9, 6.0 points lower (1.7 to 10.2) than that of singletons in the same family… CONTINUE READING

From This Paper

Figures, tables, and topics from this paper.

Explore Further: Topics Discussed in This Paper

Citations

Publications citing this paper.
SHOWING 1-10 OF 37 CITATIONS, ESTIMATED 50% COVERAGE

73 Citations

051015'01'04'08'12'16
Citations per Year
Semantic Scholar estimates that this publication has 73 citations based on the available data.

See our FAQ for additional information.

References

Publications referenced by this paper.
SHOWING 1-10 OF 24 REFERENCES

The Aberdeen children of the 1950 s cohort study : background , methods and follow - up information on a new resource for the study of life - course and intergenerational effects on health

  • GD Batty, Morton SMB, D Campbell, H Clark, G Davey-Smith, M Hall
  • Paed Perinat Epidemiol
  • 2004

Similar Papers

Loading similar papers…