  Randomised trials with continuous outcomes are often analysed using ANCOVA,
with adjustment for prognostic baseline covariates. In an article published
recently, Wang \etal proved that in this setting the model based standard error
estimator for the treamtent effect is consistent under outcome model
misspecification, provided the probability of randomisation to each treatment
is 1/2. In this article, we extend their results allowing for unequal
randomisation. These demonstrate that the model based standard error is in
general inconsistent when the randomisation probability differs from 1/2. In
contrast, the sandwich standard error can provide asymptotically valid
inferences under misspecification when randomisation probabilities are not
equal, and is therefore recommended when randomisation is unequal.
