As I'm sure you and she are aware, the gut-feel regression has a very poor historical track record at separating confounding variables, particularly outside of

As I'm sure you and she are aware, the gut-feel regression has a very poor historical track record at separating confounding variables, particularly outside of controlled studies. The decision to vent or not is being made by an expert physician, taking many variables into account, so it's very difficult to tease out a meaningful conclusion just by comparing the two survival rates.