• Coronary intervention
• antiplatelet treatment
• public health

To the Editor: The statistics of propensity adjustment which Harjai et al1 have used with some modifications is a recognised tool to increase the value of non-experimental data.2 3 However, these authors have used propensity statistics less efficiently than other studies in this area.2 3 In fact, propensity statistics have only been introduced by Harjai et al in their multivariate regression analysis, but no 1:1 propensity matching has been made to identify …