There are 4.9 million Alt-A and subprime loans. Alt-A's are loans to those with higher credit ratings that have special introductory features. Subprimes are loans to people with marginal credit.
15% of Alt-A loans were at risk in at the start of the year. 30% of subprimes were at risk.
A majority of Alt-A loans will "reset," increase interest, in the next 2 plus years. 25% of subprimes will do the same at a much higher rate. That spells disaster since the "resets" are a major trigger for bankruptcy.