Comparison of two types of epidemiological surveys aimed at collecting daily clinical symptoms in community-based longitudinal studies.

Annals of Epidemiology
Gwenyth LeeCONTENT Investigators

Abstract

Investigators use prospective community-based studies to collect longitudinal information on childhood diarrhea. The interval in which data are collected may affect the accuracy and interpretation of results. Our objective was to compare data of reported daily clinical symptoms from surveys conducted daily versus twice-weekly surveys. We conducted our study in Lima, Peru, between October and December 2007. We asked 134 mothers to report daily symptoms by using a twice-weekly survey. We conducted daily surveys for the same data on 25% of participants randomly selected each day. We analyzed intersurvey variability by using Cohen's kappa and Signal Detection Theory (SDT). We collected 6157 and 1181 child-days of data through the twice-weekly and daily surveys, respectively. The prevalence of diarrhea, fever, vomiting, and cough were 6.4%, 1.6%, 2.1%, and 22.7% from the twice-weekly survey and, 6.4%, 2.0%, 2.4%, and 26% from the daily survey, respectively. Despite similar prevalence, 20% of days with reported diarrhea were discrepant between the two surveys, and agreement in the report of diarrhea decreased as time between the interviews increased (p = .03). Although twice-weekly surveys provide an adequate estimate of diarrheal pr...Continue Reading

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Citations

Jan 24, 2012·International Journal of Epidemiology·Wolf-Peter SchmidtSandy Cairncross
Aug 4, 2010·Emerging Themes in Epidemiology·Wolf-Peter SchmidtZaid Chalabi
Oct 12, 2014·Clinical Infectious Diseases : an Official Publication of the Infectious Diseases Society of America·Stephanie A RichardUNKNOWN MAL-ED Network Investigators
Jan 1, 2014·The Pediatric Infectious Disease Journal·Philip J BudgeUNKNOWN RESPIRA-PERU Group

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