The problem is that in this cross-sectional study, there is no way to determine the direction of the observed relationship.

Sadly, Stan Glantz continues to feel the need to lie to the public in order to try to discredit opinions with which he does not agree. And while I have no problem discrediting statements by exposing the truth about financial relationships which present conflicts of interest, I do have a problem with spreading false lies that make the public believe that there is a conflict of interest present and which therefore defame the reputation of the individual. Not only is this unlawful, but it is unethical as well.

G. Zero.

The Rest of the Story

Neither the survey approach or the RCT approach is perfect. Both have major strengths and significant limitations. The best way to proceed is to conduct both types of studies and to synthesize the results across study designs, keeping in mind the methodological strengths and limitations of each individual study. Only by looking at this totality of the evidence can we draw valid scientific conclusions.

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