The additional annual cost of informal caregiving per person was $3,630 for mild dementia, $7,420 for moderate dementia, and $17,700 for severe dementia. Total national annual cost of caregiving for those with dementia is $18 billion.
Langa, Kenneth M., Michael E. Chernew, Mohammed U. Kabeto, A. Regula Herzog, Mary Beth Ofstedal, Robert J. Willis, Robert B. Wallace, Lisa M. Mucha, Walter L. Straus and A. Mark Fendrick. National Estimates of the Quantity and Cost of Informal Caregiving for the Elderly with Dementia. Journal of General Internal Medicine. 2001; 16(11): 770-8. http://www.blackwell-synergy.com/doi/full/10.1111/j.1525-1497.2001.10123.x