> Yea, reading the study, I don't see anything about controlling for fitness level. Doesn't table 2 and 3 show that they examined a bunch of relevant covariate

> Yea, reading the study, I don't see anything about controlling for fitness level. Doesn't table 2 and 3 show that they examined a bunch of relevant covariates including physical activity, smoking, alcohol use, diabetes, hypertension, cholesterol, statin and aspirin use? It's at least "something" at the very least and I'm not sure how you missed it if you were actually reading the study because it's very hard to miss.