Community-dwelling elderly with mild dementia received an additional 8.5 hours per week of informal care compared to those with normal cognition. Those with moderate dementia received an additional 17.4 hours and those with severe dementia received an additional 41.5 hours.
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