@article{gan04som,
  title = {Some Unexplained Aspects of Analysis of Covariance in Pretest-Posttest Studies},
  volume = {60},
  journal = {Biometrics},
  author = {Ganju, Jitendra},
  year = {2004},
  keywords = {ancova,change,change-scores,conditional-analysis,fixed-random-baseline-measurement},
  pages = {829-833},
  citeulike-article-id = {13265393},
  posted-at = {2014-07-14 14:09:55},
  priority = {0},
  annote = {"adjusting for the pretest variable in observational studies may actually introduce bias where none previously existed"}
}