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The patient identification period was from January 1 , 2001to June 30 , 2005
The first observed claim during the patient identification period defined the index date; the previous 180 days were defined as the pre-index period; and the follow-up period was the 365 days after the index date.
In another recent study using a patient identification period from 2005 2008, Berger et al. compared medical and pharmacy costs of PAH patients before and after initiating sildenafil [ 23].
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If a patient had evidence of use of more than one of the medications of interest during the identification period, that patient could have multiple index dates and be included in more than one cohort, as described in the "Patient cohorts" section.
Using an integrated analysis of administrative claims data, medical and drug utilization were measured during the 12-month period after patient identification.
First, patients with medical claims for rituximab during the identification period were identified and the first administration date defined as the index date for rituximab.
Using the unique patient identification numbers, the first admission during the two-year period was defined as the incident admission.
The vast majority of patients (97%%) had only one episode during the CAP identification period.
A total of 63,453 patients with a diagnosis of bladder, colorectal, lung, ovarian, pancreatic, or gastric cancer, and who were undergoing chemotherapy during the index event identification period, were identified from the IMS/PharMetrics Patient-Centric database.
Benefits of an EMR include the following: it is paperless, it tracks data over a long period of time, and it provides effective patient identification and preservation of records (vaccinations, blood pressure readings, X-rays).
15, 20, 21 However, the majority of the patients did not have a Barrett's esophagus claim during the identification period, and can be reliably assumed to have taken a PPI for their GERD-related symptoms.
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