Yet another pointless piece of research reporting.
As Lupusina said, the figures X no out of the children who died were co-sleeping is pointless. It doesn't answer the question we want answered.
What we want to know is:
how great is the risk to my baby if I co-sleep?
To know that we must know two things:
what percentage out of all co-sleeping babies died?
what percentage out of all non co-sleeping babies died?
That and nothing else is your risk factor.
Let's try another example:
at a shipwreck, 300 children were wearing inflatable life-jackets, the remaining 20 only had arm rings.
25 of the children wearing lifejackets died, all 20 of the ones wearing arm rings also perished
by the logic followed by some above posters, this would prove that lifejacket wearing is more dangerous (more of the drowned children wore lifejackets)
in actual fact, nothing is proven until we have the complete population size for each group
personally, I believe co-sleeping is usually safe
but it's a belief nothing more
I haven't seen the relevant statistics