第二节阅读理解梯度进阶训练（4） A new study says the leading cause of disability in older people in low and middle income countries is dementia. The researchers disagree with the World Health Organization which says blindness and other vision problems are the leading cause. A study says dementia is more widespread in the developing world than has been recognized. Dementia is a loss of intellectual ability that affects memory, learning, attention, thinking and language skills. People with dementia may forget family members or not know what day it is. Sometimes they become angry or sad, hear voices, or see things that are not there. Renata Sousa from the Institute of Psychiatry at Kings College London and other researchers wrote the new report. Their study looked at the causes of disability among fifteen thousand people aged sixtyfive or older in seven countries. The countries were China, India, Cuba, the Dominican Republic, Venezuela, Mexico and Peru. The team found that dementia was the largest cause of disability in the elderly in areas other than rural India and Venezuela. Other major causes were stroke, loss of use of arms or legs, arthritis, depression, eyesight problems and gastrointestinal problems. In low and middle income countries, heart disease and cancer get much of the attention given to chronic diseases. The researchers say increased importance should be given to chronic diseases of the brain and mind. As populations age, societies will have to deal with more and more cases of dementia. The study says the elderly are nine percent of the total population of low and middle income countries today. But their numbers are growing quickly. They are expected to reach twenty percent of ...
