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

J Wood¹, D Richardson, S Wing

¹Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill 27599-8050, USA.

International Journal of Epidemiology

|April 1, 1997

Summary

This study introduces a flexible computer program for calculating person-time data, essential for disease rate analysis. The tool simplifies tabulating follow-up lengths, even with time-dependent variables, aiding epidemiological research.

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Area of Science:

Epidemiology
Biostatistics
Health Informatics

Background:

Accurate disease rate calculation requires comprehensive tabulation of individual follow-up lengths within a cohort.
Traditional methods and software often present limitations in handling complex stratifications, especially with time-dependent variables.

Purpose of the Study:

To present a straightforward computer program designed to calculate the duration of follow-up for each participant in a study.
To offer a flexible solution for generating person-time data crucial for epidemiological analyses.

Main Methods:

The study details a novel computer program for calculating and tabulating person-time data.
The program accommodates stratification by numerous variables, including time-dependent factors.

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Main Results:

The developed program enables flexible tabulation of person-time data across various characteristics.
It efficiently handles the creation of time-dependent variables and categorizes observations by any unit of person-time.
The program is compatible with multiple platforms, including personal computers.

Conclusions:

This computational method is expected to streamline the process of generating person-time datasets for disease rate analyses.
It offers a simplified approach to a critical step in epidemiological research, enhancing data usability.