Inappropriate use of covariate analysis renders meaningless results

Comment

Grover C Gilmore. J Int Neuropsychol Soc. 2007 Mar.

. 2007 Mar;13(2):370; author reply 371.

doi: 10.1017/S1355617707070464.

No abstract available

Comment in

Use of covariates in randomized controlled trials.
Van Breukelen GJ, Van Dijk KR. Van Breukelen GJ, et al. J Int Neuropsychol Soc. 2007 Sep;13(5):903-4. doi: 10.1017/s1355617707071147. J Int Neuropsychol Soc. 2007. PMID: 17853540 No abstract available.

The effect of cataract surgery on neuropsychological test performance: a randomized controlled trial.
Anstey KJ, Lord SR, Hennessy M, Mitchell P, Mill K, von Sanden C. Anstey KJ, et al. J Int Neuropsychol Soc. 2006 Sep;12(5):632-9. doi: 10.1017/S1355617706060954. J Int Neuropsychol Soc. 2006. PMID: 16961944 Clinical Trial.