it was not blind, the researchers actually knew the subjects. Secondly, th e risk of CHD is a very strong function of the risk factors in the lifestyl e of the individual and the history of those risk factors. Almost any kind of risk factor can make for a 5-10 increase of risk in developing CHD, and subjecting yourself to those risk factors has pretty much sealed your fate by age 40 regardless of abstinence from that point onward. In light of that kind of extreme sensitivity, those crummy little hazard ratios on the orde r of 0.9 are nearly insignificant. You show me a study where the risk facto rs were strictly and scientifically controlled. I suspect the researchers w ere not out to discover anything, they were out to prove childhood vaccinat ion may not be such a good thing for CHD outcomes later in life.
Assuming the scientific validity of the results, the takeaway should be tha t people with a history free of childhood infections should avoid lifestyle choices that increase their chances of developing CHD, and not that vaccin ation programs be discontinued. Actually avoiding lifestyles choices that i ncrease the risk of CHD is a good plan whether vaccinated or not.