Egert ´ (2012) extends the time coverage of the Reinhart and Rogoff (2010b) sample back to 1790.7 He finds a small negative correlation between debt and growth and, using an endogenous threshold model, some evidence of a non-linear relationship between debt and growth. However, the estimated endogenous debt-to-GDP thresholds are generally much lower than 90 percent. In addition, Egert ´ (2012) mentions that the presence and the level of the thresholds are not robust to small changes in country coverage, data frequency, and changes in the assumptions on the minimum number of observations included in each regime.