I had deja vu when I read this: then I spotted that it was published online months ago. Anyway, it's an interesting piece of research, fixing various problems around the house to reduce falls, and using waitlist controls. The measure was claims on health insurance, so these were falls which need medical attention. The intervention seems to work.
A commentary I can only describe as curmudgeonly complains that the study doesn't help us know what to do about falls in old people, but that's a different problem.
This is the latest paper from Philippa Howden-Chapman's group in Otago, New Zealand. Last time they looked at the effect of making houses warm and dry.