I agree with Welliemum that finding an association with reduced risk does not necessarily show that dummies are the cause. Her suggestion that perhaps the babies who take dummies are less likely to die of cot death anyway sounds quite plausible. Is it also possible that the smoker parents who are not giving the baby a dummy are giving themselves another cigarette instead? There may even be a link between willingness to consider giving a dummy and being a parent who is sensitive to the baby's needs and would be quicker to respond in the event of an emergency. (I'm actually strongly anti-dummy on the "yuk" factor, before anyone takes offence!)
I have an eleven-year old, so remember the great cot mattress antimony scare. In that case, the research was reported before checking up on the antimony levels in healthy babies, which were actually higher than in SIDS victims. Between the scary television programme and the revised findings, lots of parents had wrapped their child's mattresses in polythene, which of course increases the risk of suffocation.
I share Aelita's scepticism over the funding of medical research. Furthermore, the researchers will want to attract media attention in order to get funding for further research, either from grant-awarding bodies or charities. Let's hope some good comes of this.
gggimmesnownow - yes, I do think it would be a good idea if researchers kept quiet about their findings until certain hurdles had been reached. The cot mattress scare shows why. Small samples, or badly designed experiments that show only half the story, can give completely misleading information that the public should not be acting on, and that healthcare professionals ignorant of statistics should not be putting their weight behind.
Even if dummies were shown to reduce the risk of cot death, they are known to cause problems over speech and teeth. We all take small calculated risks over our children - I am allowing ds1 to walk home alone, which increases the minuscule risk of being the victim of the mad axeman and the greater risk of a road accident, but improves his independence skills. Vaccination is another example of taking a calculated risk. Dummies should be viewed in the same light - mothers should not be hassled by healthcare professionals or wider society over exercising their own choice over where to strike the balance.
The whole debate demonstrates a lack of understanding of statistics and risk among healthcare professionals and the general public, which the education system should address. However, this would hit the profits of the National Lottery (why no mad conspiracy theorist cackle icon), so may never happen.