Methods
Databases
All pathology departments in Sweden hold computerised disease registers. The first one was established in 1979 and the last in 1998. From these registers we compiled a cohort consisting of all patients registered with a gastroscopic stomach biopsy for non-malignant indications up to 31 December 2011. The 24 pathology departments provided the patients’ national registration numbers (unique identifiers for all Swedish residents) along with data on date, age, sex, and pathological-anatomical diagnosis using the systematised nomenclature of medicine morphology (SNOMED M) codes.16 Each record contained information about one examination. Therefore patients could have several records in the compiled database.
In the research database we compiled 613 637 records relating to 437 473 people who had undergone at least one endoscopic examination with stomach biopsy. We linked the database to the nationwide and 98% complete17cancer register using the national registration numbers as identifiers, where all incident cases of gastric cancer were identified. Further cross linkages with the death register, patient register, and emigration register provided the necessary information for eligibility assessment and censoring.
MethodsDatabasesAll pathology departments in Sweden hold computerised disease registers. The first one was established in 1979 and the last in 1998. From these registers we compiled a cohort consisting of all patients registered with a gastroscopic stomach biopsy for non-malignant indications up to 31 December 2011. The 24 pathology departments provided the patients’ national registration numbers (unique identifiers for all Swedish residents) along with data on date, age, sex, and pathological-anatomical diagnosis using the systematised nomenclature of medicine morphology (SNOMED M) codes.16 Each record contained information about one examination. Therefore patients could have several records in the compiled database.In the research database we compiled 613 637 records relating to 437 473 people who had undergone at least one endoscopic examination with stomach biopsy. We linked the database to the nationwide and 98% complete17cancer register using the national registration numbers as identifiers, where all incident cases of gastric cancer were identified. Further cross linkages with the death register, patient register, and emigration register provided the necessary information for eligibility assessment and censoring.
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