In an Article from "Guardian Weekly" July 29-August 4 2005 entitled "Two in three Muslims say they consider leaving"

I came across the phrase "... a new Guardian/ICM poll." Can anybody explain the abbreviation "ICM" to me?

Best wishes

It is a marketing/research firm; here is their [url="http://www.icmresearch.co.uk/default.asp "]ICM HOMEPAGE[/url].

I am more interested in the BrE phrase two in three Muslims, where I would have written two out of three Muslims.
(So would I.)