This Study Aims to Determine the Incidence, of Hepatitis B Diagnosis Among Diabetes Mellitus Patients of 0-80 Years of Age

Incidence of Hepatitis B Diagnosis Among Diabetes Mellitus Patients of 0-80 Years of Age, in the United Kingdom Clinical Practice Research Datalink (CPRD)

This study is being conducted to assess the risk of hepatitis B (HepB) diagnosis among diabetes mellitus (DM) and non-DM patients of 0-80 years of age with in a large population-based cohort in United Kingdom (UK) using data from the CPRD database.

The study is a retrospective, observational, descriptive, cohort study, in DM and non-DM patients of 0-80 years of age. As a first step the eligible baseline population from CPRD will be defined as per the data quality qualifiers, which include subjects aged 0-80 years, "acceptable for research" registered in practices classified as "up to standard" by the CPRD for the time period 2000- 2012. The following cohorts will be defined from the baseline population:

• DM cohort: Patients diagnosed with type 1 or type 2 DM, as confirmed by diagnosis medical codes with or without a DM related drug or monitoring devices prescription.
• Non-DM cohort: Patients with the absence of personal history of DM diagnosis or antidiabetic drug or monitoring devices prescriptions.

From the above defined cohorts, HepB cases will be identified based on clinical diagnosis codes, Hospital Episodes Statistics (HES) or positive diagnostic laboratory tests results.

Inclusion Criteria:

• Subjects, 0 to 80 years of age during the study period.

• Subjects acceptable for research as per CPRD definition:

  • Acceptable flag for research.

• Subjects with at least 12 months of observation time at the time of inclusion in the study:

  • Subjects have to be registered in the CPRD database for at least 12 months at the date of inclusion in the study.
  • Subjects have to be registered in a general practitioner practice classified as 'up to standard' for at least 12 months at the date of inclusion in the study.

• Particular Case of New Born Children.

  • To ensure inclusion of subjects less than 1 year of age, they will be included regardless their observation time in CPRD.

• Inclusion Date

  • Inclusion criteria will be assessed for each calendar year between the Years 2000 and 2012.

Exclusion Criteria:

• For the analyses requiring the inclusion of HES data, HES records linked with more than one CPRD patient will be excluded from the analyses.