Diseases of the respiratory system refer to a wide variety of diseases that affect the airways and the lungs. Respiratory diseases can be infectious and chronic. Chronic diseases such as asthma and chronic obstructive pulmonary disease (COPD) can be long-lasting. Factors such as smoking, air pollution and frequent lower respiratory tract infection during childhood can influence the risk of developing some diseases of the respiratory system. The treatment of respiratory diseases is associated with significant healthcare costs, and respiratory disease is the third biggest cause of death in England.
The aim of this study is to describe, over time, the number of people who have a respiratory disease in the UK and estimate the healthcare costs associated with managing these conditions. How often a disease occurs in our population plays an important role in planning NHS services and identifying areas for future research and development.
Research-quality patients with respiratory disease will be selected. The number of people developing the condition (its incidence) will then be calculated on a yearly basis for the duration of the data source, and the proportion of people having that condition at the midyear point (its point prevalence) will be calculated over the same period. Time to death and patients’ characteristics will be presented. The frequency and cost of primary care consultations, prescriptions, outpatient attendances and inpatient stays will also be determined.
Our aim is to determine the descriptive epidemiology of diseases involving the respiratory system and estimate and cost healthcare use by people with these conditions. Acceptable patients will be selected from Clinical Practice Research Datalink (CPRD) GOLD and Aurum if they have a medical code indicative of a respiratory disease. For sensitivity analyses, a subcohort will comprise English patients eligible for linkage to the Hospital Episode Statistics (HES) admitted patient care (APC) and outpatient datasets, and their Office for National Statistics (ONS) death registration data. The start of CPRD follow-up will be defined as the later of the patient’s registration date and, in CPRD GOLD, their practice’s up-to-standard date; the end of CPRD data follow-up will be defined as the earliest of the patient’s transfer-out date, date of death (if applicable), and the last data-collection date for their practice. The presentation date will be defined as that of the patient’s first ever record with a code indicative of a respiratory disease. For incident patients, selected if their presentation date occurs at least 90 days after registration, detailed patient characteristics will be determined. Time to death will be presented using Kaplan–Meier analysis. Healthcare resource use and associated costs will be estimated before and after presentation and comprise primary care contacts, primary care prescriptions, outpatient attendances and hospital admissions. Healthcare costs will be compared with a non-exposed control group of acceptable, HES eligible patients matched in a 1:1 ratio on age, sex, registration status at the date of the case’s start of follow-up and general practice where appropriate. Quintiles of deprivation score (Practice Level Index of Multiple Deprivation) will be described. Incidence and point prevalence will be calculated on a yearly basis.
This study will provide valuable information on the healthcare burden associated with respiratory disease and help to inform healthcare decision-making.
Patient characteristics; Comorbidities; Healthcare resource use; Healthcare costs; All-cause mortality; Incidence; Prevalence
Craig Currie - Chief Investigator - Pharmatelligence Limited t/a Human Data Sciences
Sarah Holden - Corresponding Applicant - Pharmatelligence Limited t/a Human Data Sciences
Bethan Jones - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Chris Shepherd - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Christian Bannister - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Christopher Morgan - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Darren Summers - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Elgan Mathias - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Ellen Hubbuck - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Leah Fisher - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Rhiannon Thomason - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Sara Jenkins-Jones - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
Thomas Berni - Collaborator - Pharmatelligence Limited t/a Human Data Sciences
HES Admitted Patient Care;HES Outpatient;ONS Death Registration Data;Practice Level Index of Multiple Deprivation