positive predictive value

  1. C

    Sample size estimation for evaluation of diagnostic tests

    I am studying 2 blood tests (A and B) to detect infection following exploratory laparotomy undertaken to treat various surgical lesions. In other words, the population is somewhat heterogenous. In a similar previous study (51 patients), other authors reported on test A. The blood will be sampled...
  2. M

    Assess statistical significance of two PPVs

    Assess significance of the difference between two PPVs I recently validated a medical diagnosis in order to compose a study population. To do so, we classified each patient with a diagnosis of interest as probable, possible, or unlikely case, depending on how likely we believed the diagnosis to...