The researchers foundation their findings on 221 patients with dementia and 229 healthful folks from the same area, randomly selected from census registers. The patients, who were all drawn from 23 family doctor practices in one area between 1998 and 2000, were aged between 55 and 99. The assessment group had been aged between 60 and 94. Related StoriesSpecial orchestra boosts feeling and confidence in patients with dementiaMayo Clinic's Florida campus awarded NIH grant to identify vascular risk factors in aging and dementiaStudy finds great prevalence of dehydration in the elderly living in UK treatment homesAll individuals were asked either directly or via family members about their medical history and way of life, including marital status and sociable support network. Information was obtained on complete employment history also, with psychosocial job components assigned, using a validated scoring program.All patients provided written informed consent. The analysis was conducted relative to the protocol, which is available at NEJM.org. Angiography was performed, followed by both gray-level and radiofrequency intravascular ultrasonography of the left primary coronary artery and the proximal 6 to 8 8 cm of every of the major epicardial coronary arteries, with the use of a synthetic-aperture-array, 20-MHz, 3.2-French catheter with motorized catheter pullback .