These predictions should only be treated as a suggestion. There are many confounding factors which often skew these predictions. Factors which often affect predictions are a person's procedural memory, individual differences, physical abilities, age of onset and variation in the support provided by carers.
Living alone assumes that the person can do all of their self-care activities independently, but within ACL 4 High, some daily or weekly assistance is usually required. Household management tasks usually require even more assistance.