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Children born after intracytoplasmic sperm injection

BMJ 1999; 319 doi: (Published 03 July 1999) Cite this as: BMJ 1999;319:52

What do authors mean by control infants?

  1. J M Bland, Professor of medical statistics (
  1. St George's Hospital Medical School, London SW17 0RE
  2. Royal Free and University College Medical School, Department of Community Child Health, Royal Free Campus, London NW3 2PF
  3. Centre for Assisted Reproduction, Park Hospital, Nottingham NG5 8RX
  4. Department of Obstetrics and Gynaecology, St Bartholomew's and the Royal London School of Medicine and Dentistry, Royal London Hospital, London E1 1BB
  5. Department of Reproductive Medicine, St Mary's Hospital, Manchester M13 0JH

    EDITOR—Sutcliffe et al compare babies born through intracytoplasmic sperm injection with control babies (matched for social class, maternal education, region, and sex) born after unassisted conception.1 In their table they give means, standard deviations, and 95% confidence intervals for the two groups separately. These confidence intervals tell us about the estimation of the mean in the population of which the babies are …

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