title: Measuring treatment and scale bias effects by linear regression in the analysis of OHI-S scores.
abstract: A linear regression model is presented for estimating unbiased treatment effects from OHI-S scores. An example is given to illustrate an analysis and to compare results of an unbiased regression estimator with those based on a biased simple difference estimator.
mesh_terms: D003729:Dental Care; D003753:Dental Health Surveys; D006801:Humans; D008433:Mathematics; D008954:Models, Biological; D009911:Oral Hygiene Index; D012044:Regression Analysis; D013223:Statistics as Topic