Case definitions were often based on diagnoses identified in multiple data sources (e.g., hospital discharge abstracts
and physician billing claims; see Table 2).
We are grateful to the New York State Department of Health for providing discharge abstract
and physician licensure data, to the New York Department of Insurance and the various liability carriers for providing premium data, and to the Health Insurance Association of America for providing the fee information.
Full-text articles were included if both reviewers agreed that the article met all eligibility criteria: validated AMI ICD-9 or ICD-10 codes (including any country-specific modification in these coding frameworks); specified the ICD codes used in hospital discharge abstract
data; and reported sensitivity, specificity, positive predictive value (PPV), or negative predictive value (NPV) or provided the data required to calculate these values.
The PPC System has the limitations inherent in any system that uses discharge abstract
codes, since the accuracy and completeness of coding can vary across hospitals, and may vary from one diagnosis to another within a hospital (Iezzoni, 1997).
Three databases were thus created for the same hospital discharges: (1) ICD-10 discharge abstract
data, (2) ICD-9-CM discharge abstract
data, and (3) chart review data.
Successful merges were obtained for 46,368 deliveries in 1988 and the first 5 months of 1989 (65.6 percent of birth certificate records, 71.8 percent of mothers' discharge abstract
records, 76.0 percent of infant discharge abstract
records) and 86,813 deliveries in the last 10 months of 1990 and 1991 (88.1 percent of birth certificate records, 91.4 percent of mothers' discharge abstract
records, 91.3 percent of infant discharge abstract
Hospital discharge abstract
data for 1985 were obtained from each participating hospital.
(a) Patient in "less" group if less then 20% of all ESBC surgeries (stage I and II) in the 50-mile radius around the patient's residence in the year of diagnosis were BCS; (b) Patient in "near" group if distance to radiation treatment center in year of diagnosis is less than 19 miles.; (c) Modified Charlson comorbidity indices developed by mapping Clinical Classifications Software (CCS) diagnosis and procedure groups available on each HCUP discharge abstract
into Charlson index groups.
Although this information is not routinely on the discharge abstract
or bill information, it can be easily added.
All-patient hospital discharge abstract
data and nurse staffing data were obtained from 11 states that collect both sets of information: Arizona, California, Maryland, Massachusetts, Missouri, Nevada, New York, South Carolina, Virginia, West Virginia, and Wisconsin.
(Preparation and linkage of the discharge abstract
and Medicare enrollment data upon which this article is based were performed under contract no.
The MEDPRO data files include data elements found in the hospital discharge abstract
, date of death (as determined from HCFA social security files), and a unique patient identifier: the HCFA identification number (HICN).