Intended for healthcare professionals

Endgames Statistical question

Statistical significance and confidence intervals

BMJ 2009; 339 doi: (Published 02 September 2009) Cite this as: BMJ 2009;339:b3401
  1. Philip M Sedgwick, senior lecturer
  1. 1St George’s Hospital, University of London, London SW17 0RE
  1. p.sedgwick{at}

    A prospective population based cohort study investigated the association between occupation and pregnancy outcome for mothers who had missed antenatal visits. The mean birth weight was 3371 g (95% confidence interval 3274 to 3469) and 3227 g (3140 to 3315 g) for babies born to mothers in non-manual and manual jobs, respectively.

    On the basis of the above information, which of the following can be deduced for mothers who missed antenatal visits?

    • a) In the population, 95% of mothers with a non-manual occupation have a baby with a birth …

    View Full Text

    Log in

    Log in through your institution


    * For online subscription