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Some COI studies assign a medical expenditure based on primary diagnosis [ 94].
VACCR initially identified 78 incident cases of male breast cancer based on primary diagnosis and histological confirmation.
Demographic data, HIV status, admission discipline (based on primary diagnosis), ward and MRSA screening results were collected from medical records of all screened patients.
Initially, all admissions (both with and without diabetes) were categorized into 260 groups of clinical conditions based on primary diagnosis from the discharge diagnostic code.
For each patient selected in 2009 (exposed patient), a patient matched for disease type (based on primary diagnosis with the same ICD code), sex and age within 5 years of interval (control patient) was retrospectively selected from the same unit with the closest hospital admission date in 2008 (the indexed hospital admission in the non-NC care cohort) to that of the exposed patient.
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Other limitations include the collection of hospitalization data, which was based on primary discharge diagnosis, and the broader categorization of causes of hospitalization, which removed some granularity in the data.
Overall, there were no significant differences in clinical cure rates between tigecycline and imipenem/cilastatin based on primary intra-abdominal diagnosis.
We used the Medicare claims records from the Medicare Provider Analysis and Review (MEDPAR) file to select only emergency admissions, and to identify previous cause of hospital admissions, based on primary and secondary diagnosis codes of all hospitalizations for any causes up to one year prior to the initial condition-specific hospitalization.
All patients with IVDU were identified by using the Patient Data management System of the renal units of the GU and AMK that are based on primary and secondary diagnosis according to the international Classification of Diseases 10th Revision (ICD-10).
Then overall mental comorbidity was examined stratified by major diagnostic category (MDC), a system which assigns a discharge to one of 25 (plus a leftover) categories of illness type/body system based on primary (ICD-9-CM) diagnosis.
This system is used to describe the anatomical extent of the disease at diagnosis based on primary tumor size and extent of tumor growth (T), regional lymph node metastasis (N) and distant metastasis (M), and is the basis for stage grouping these patients [ 7, 8].
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