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A third of people who notice dementia symptoms in themselves or a loved one keep quiet about it for a month or longer, according to a new survey out of the U.K.

Only 15% of the 1,100 patients and caregivers surveyed brought up their observations right away, and 11% still haven’t, according to the survey, released Monday by the London-based Alzheimer's Society. Participants included diagnosed dementia patients and their caregivers, as well as potential dementia patients and their caregivers.