But he posts some interesting reactions from others, and some comments of his own.
Of course, none of these bloggers seem to have actually read the study (or at least the abstract, which is understandable to most lay people). But where would the fun be in that? It's far easier simply to use press reports of the study as a means of confirming your prejudicies. As Erica Barnett put it:
The funniest/saddest/most ridiculous thing about this study "proving" that housework "cuts the risk of breast cancer" by 20 to 30 percent: The researchers' actual conclusion, buried in the 12th paragraph of this BBC story, was that "moderate physical activity" of any kind--walking, riding a bike, masturbating--reduces the risk of breast cancer. So what did the BBC and other media focus on? What else--domestic servitude.
Even more interestingly, as pointed out on Our Bodies Our Blog, a similar study looking at risk factors for endometrial cancer concluded the same thing (that moderate exercise is protective) about two years ago and was spun the same way. Not surprisingly, anti-feminist bloggers like Vox, Heretic, and Eternal Bachelor were all too eager to take such spin to ever more crude and obnoxious levels.
Although I'm not as "unconvinced" as Medpundit, I do agree that there are problems with this study and that it probably does not mean that housework in and of itself protects against breast cancer any more than other moderate activity. However, I do still have to note that certain aspects of the data seem inconsistent. One observation that leapt out at me was that a 28% higher fraction of the "noncases" (women who didn't develop breast cancer) were nulliparous (they never had children). This is inconsistent with numerous previous studies that demonstrate that nulliparity is a risk factor for the development of breast cancer. Similarly, the fraction of noncases whose age at first pregnancy was under 20 was 36% higher than among cases, again not entirely consistent with decades worth of studies that show that a young age at first pregnancy reduces the risk of breast cancer. True, taken as a whole, there was a tendency towards a younger age at first pregnancy, but the authors never stated whether any of these differences between case and noncase groups was statistically significnat; indeed, other than the trend towards a lower age at first pregnancy, these differences weren't mentioned at all. On the other hand, as one would expect, the cases tended to be older by a few years and in the postmenopausal women, 53% more cases used hormone replacement therapy, consistent with HRT as a (now) known risk factor for breast cancer.
In other words, the characteristics of the group seem to be all over the map, which makes me wonder about how valid the correlation that they found is in actuality. I wouldn't go so far as one wag did and suggest that, because housework was the most common activity among the women in the study that the results are like finding a correlation among breast cancers and wearing bras and trying to blame the bras, but that's a good way of putting the results in perspective. That's why my perspective, all can be concluded from this study is that there may be some sort of "sweet spot" for physical activity as far as producing a protective effect against breast cancer, with moderate physical activity being best. It is also possible that, as the authors speculate, that more regular moderate physical activity may be better than less frequent but more strenuous activity as far as protection from cancer. It is not clear whether one, both, or neither of these hypotheses explain this study's results. What is clear, however, is that all too many men are so hostile to feminism and women's taking on roles outside of that of wife and mother that they'll leap at anything to justify their bigotry, even to the point of using gruel as thin as the results of this study.
http://scienceblogs.com/insolence/2007/01/obviously_a_male_conspiracy_is_at_work.php