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Table 1 Annual profiles of corroborated AD patients, 2001-2005

From: Using U.S. Medicare records to evaluate the indirect health effects on spouses: a case study in Alzheimer’s disease patients

Population annual characteristics 2001 2002 2003 2004 2005
Number 23,038 30,935 35,392 37,500 34,601
Observed AD prevalence1 1.6% 2.1% 2.3% 2.4% 2.2%
Gender      
Male 28.9% 28.9% 29.3% 29.5% 29.2%
Female 71.2% 71.1% 70.7% 70.5% 70.8%
Age in year (<1% in below 55 ages)      
Age 55-64 1.1% 1.1% 1.2% 1.2% 1.2%
Age 65-74 12.4% 11.6% 11.0% 10.7% 10.0%
Age 75+ 86.3% 87.0% 87.5% 87.8% 88.5%
Mean age 82.41 82.72 82.91 83.03 83.36
Race/ethnicity      
White 87.5% 87.0% 86.7% 86.5% 86.3%
Black 9.0% 9.3% 9.4% 9.5% 9.5%
Other race/ethnicity 3.5% 3.7% 3.9% 4.1% 4.2%
Geographical region      
Northeast 20.2% 20.2% 19.9% 19.8% 19.6%
Midwest 26.0% 25.2% 25.1% 24.8% 24.8%
South 40.0% 40.6% 40.7% 41.0% 41.0%
West 12.0% 12.2% 12.4% 12.7% 12.9%
Other 1.9% 1.8% 1.8% 1.8% 1.7%
Urban 72.5% 72.8% 73.1% 73.4% 73.5%
Rural 24.8% 24.5% 24.1% 23.7% 23.6%
Unknown 2.7% 2.7% 2.8% 2.9% 2.9%
Patient status      
Nursing home at index2 39.5% 31.8% 26.6% 22.5% 20.3%
Nursing home entry during follow-up2 11.2% 13.4% 12.1% 11.3% 10.9%
Death during follow-up 68.3% 60.2% 48.4% 34.6% 20.3%
Mean follow-up months 34.6 35.6 35.7 33.9 32.4
Identified spouses      
Number 2,581 3,234 3,606 3,717 3,184
Percent of total AD patients 11.2% 10.5% 10.2% 9.9% 9.2%
Incident AD diagnoses 3      
Number N/A4 9,447 8,728 7,758 3,518
Percent of total AD patients N/A4 30.5% 24.7% 20.7% 10.2%
Identified incident AD spouses      
Number N/A4 1,077 975 836 342
Percent of total AD patients N/A4 3.50% 2.80% 2.20% 1.00%
  1. 1Percentage of listed year’s Medicare fee-for-service population.
  2. 2To be considered a nursing home resident, a patient’s Medicare Part B claims had to record a pattern of nursing home-specific evaluation and management codes and/or nursing home place of service. This pattern had to be indicative of long-term nursing home residency rather than typical post-acute care.
  3. 3Incident cases have ≥12 months of Medicare fee-for-service eligibility prior to their first AD diagnosis.
  4. 4Lack of data before 2001 meant that there could be no determination of incidence during that year.
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