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Washout period
In a cross-over trial:] The stage
after the first treatment is withdrawn, but before the second treatment is started. The washout
period aims to allow time for any active effects of the first treatment
to wear off before the new one gets started
Weighted least squares
regression
[In meta-analysis:] A meta-regression technique for estimating the parameters of a regression model, wherein
each study's contribution to the sum of products of the measured
variables (study characteristics) is weighted by the precision of that
study's estimate of effect.
Weighted mean
difference
See mean
difference.
WMD
See mean difference