Skip Navigation

This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (9)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Wood, J
Right arrow Articles by Wing, S
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Wood, J
Right arrow Articles by Wing, S
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

International Journal of Epidemiology, Vol 26, 395-399, Copyright © 1997 by International Epidemiological Association

ARTICLES

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

J Wood, D Richardson and S Wing
Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill 27599-8050, USA.

BACKGROUND: 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. METHODS: This paper presents a simple computer program which calculates the length of follow-up for each person in a study. RESULTS: 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. CONCLUSIONS: This method should simplify the task of creating person-time data for analyses of disease rates in epidemiological studies.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 Occup. Environ. Med.Home page
J Wellmann, S K Weiland, G Neiteler, G Klein, and K Straif
Cancer mortality in German carbon black workers 1976-98
Occup. Environ. Med., August 1, 2006; 63(8): 513 - 521.
[Abstract] [Full Text] [PDF]

Home page
 Occup. Environ. Med.Home page
S Wing and D B Richardson
Age at exposure to ionising radiation and cancer mortality among Hanford workers: follow up through 1994
Occup. Environ. Med., July 1, 2005; 62(7): 465 - 472.
[Abstract] [Full Text] [PDF]


Disclaimer:
Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.