Context
Example 2:
Approximately 10% of U.S. Citizens over the age of 65 are affected by Alzheimer Disease (AD). Furthermore, potentially 50% of individuals over the age of 85 may be at risk (Greene, et al. 461). AD is a disease that results in progressive deterioration of mental and, eventually, physical functions. Scaled according to the Global Deterioration Scale, this progressive decline ranges from 1 to 7 with 1 corresponding to normal traits, 4 to moderate, such as inability to perform complex tasks, and 7 to severe deterioration characterized by loss of verbal abilities, psychomotor skills such as walking or sitting, bowel and bladder continence, and the ability to smile and feed oneself (Bennett 95; Greene, et al. 464).
This is a good introduction when the audience is part of an academic field that values objectivity, criteria-based definitions and analytical diagnosis. It would be a poor introduction in a humanities field.