Masturbation frequency and prostate cancer

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There have been a lot of misleading threads here lately because of a recent Harvard study, which were are wrought with poor (most often, media) interpretations of the study, and and in general bad advice.

A better, more precise study from 2008 shows the opposite


>Increased rates of prostate cancer was associated with high rates of masturbation , especially in young adults.
>Sexual activity and prostate cancer risk in men diagnosed at a younger age
http://onlinelibrary.wiley.com/doi/10.1111/j.1464-410X.2008.08030.x/full

As you can see in pic related, the high masturbation group had the strongest correlation with instances of prostate cancer.
It in fact, is the most statistically significant relationship in the entire study.

Oppositely, in the 2008 study, low rates of masturbation were not associated with prostate cancer.


The Harvard Study isn't good in comparison:
>They failed to distinguish between masturbation and sex.
>Nonidentifiability, ie, the '>21 ejaculations per month' covers a huge range of potentially very different populations.
>No controls
>non-linear groupings (e, 0 to 3; 4 to 7; 8 to 12; 13-20, and 21+ Ejaculations Per Month).

As someone who has published papers, it is clear what they: they are misusing statistical methods so the results conform to their hypothesis.
The nonidentifiability of the >21 undermines the usefulness in its ability to predict causality in this group. It's very likely that higher amounts did have increased risk, so they kept altering the highest frequency group downward until it regressed toward the mean they desired.
I have contacted the European Journey of Urology expressing these concerns and asking that the paper be retracted until they are able to correct them.

Also odd,
The Harvard group failed to cite the 2008 study in their brief literature review and ignored it's existence, which was a substantial development since their initial findings.