Standard Methods
1. Crude Hospitalization Rate
Total # Hospitalizations in County
____________________________________________
Total # People in County
Numerator: OSHPD data 2004-2006
Denominator: CHIS data, 2005 population estimates
Variance =
2. Age-Adjusted Hospitalization Rate
Σ[Age-Specific Rates (Age Group 1) X (Standard Population (Age Group 1)]
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Total # People in Standard Population
Age-Specific Rates =
[Total # Hospitalizations in County (Age Group 1)]
____________________________________________
[Total # People inCounty (Age Group 1)]
Age- and Prevalence-Specific Rate Numerator: OSHPD data 2004-2006
Age- and Prevalence-Specific Rate Denominator: CHIS data (2003, 2005, 2007) disease prevalence estimates
Variance = Sum of the age-specific rate variances
Methods That Incorporate Disease Prevalence
3. Prevalence-Adjusted Hospitalization Rate
Total # Hospitalizations in County
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Total # People Reporting ACS Condition in County
Numerator: OSHPD data, 2004-2006
Denominator: CHIS pooled data (2003, 2005, 2007) disease prevalence estimates
Variance =
4. Age- and Prevalence-Adjusted Hospitalization Rate
Σ[Age- and Prevalence-Specific Rates (Age Group 1) X (Standard Population (Age Group 1)]
_________________________________________________________________
Total # People in Standard Population
Age- and Prevalence-Specific Rates =
Total # Hospitalizations in County (Age Group 1)
_________________________________________________
[Total # People Reporting ACS Condition in County(Age Group 1)]
Standard Population: US Census 2000 population
Age- and Prevalence-Specific Rate Numerator: OSHPD Data 2004-2006
Age- and Prevalence-Specific Rate Denominator: CHIS Data (2003, 2005, 2007) Disease Prevalence Estimates
Variance = Sum of the age-specific rate variances

Abbreviations: OSHPD, Office of Statewide Health Planning and Development; CHIS, California Health Interview Survey; ACS, ambulatory care sensitive.