A simple program to create exact person-time data in cohort analyses

International Journal of Epidemiology
J WoodS Wing

Abstract

Before disease rates can be calculated a tabulation of the length of follow-up for each person in the cohort has to be made. In complicated analyses such tabulations are often stratified by many characteristics, some which show no change with time, such as gender or year of birth, and some which do change with time, such as age or cumulative exposure. Available computer programs often restrict the way these tables can be made, particularly when handling time-dependent variables. This paper presents a simple computer program which calculates the length of follow-up for each person in a study. Person-time data can be tabulated by a large number of variables using this method. This program is extremely flexible in the way that time-dependent variables can be created, can categorize observations by any unit of person-time, and will run on a range of platforms including a personal computer. This method should simplify the task of creating person-time data for analyses of disease rates in epidemiological studies.

Citations

Jun 18, 2005·Occupational and Environmental Medicine·S Wing, D B Richardson
Feb 25, 2006·Occupational and Environmental Medicine·J WellmannK Straif
Nov 19, 2008·Epidemiologic Perspectives & Innovations : EP+I·Klaus Rostgaard
Jul 15, 2011·Diabetology & Metabolic Syndrome·Hans-Werner HenseWolf U Batzler
Aug 17, 2011·International Journal of Environmental Research and Public Health·Yi SunWeihong Chen
Oct 28, 2008·American Journal of Epidemiology·David B Richardson
Oct 12, 2010·Revue D'épidémiologie Et De Santé Publique·J-L Marchand
Jan 30, 2004·American Journal of Industrial Medicine·Steve WingGary Mihlan
Mar 30, 2006·International Journal of Cancer. Journal International Du Cancer·Edwin van Wijngaarden, Mustafa Dosemeci
Jun 7, 2019·Occupational and Environmental Medicine·Kaitlin Kelly-ReifDavid B Richardson

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.