Crossover trialsBMJ 2009; 338 doi: https://doi.org/10.1136/bmj.b1028 (Published 19 March 2009) Cite this as: BMJ 2009;338:b1028
- John Fletcher, clinical epidemiologist
- 1BMJ, London WC1H 9JR
Which of the following statements apply to crossover clinical trials?
a) They are not subject to confounding by age, sex, or most personal characteristics
b) Randomisation is not possible
c) They are useful in studies using mortality as the endpoint
d) They …