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An Item Response Theory Analysis of Safety Knowledge in Colorado Farm Residents

Beseler, Cheryl L. PhD; Stallones, Lorann PhD, MPH

Journal of Occupational & Environmental Medicine:
doi: 10.1097/JOM.0b013e31820f3843
Original Articles
Abstract

Objective: This study was designed to identify safety knowledge questions that differentiated those with high and low vulnerability to injury and assess differences in safety questions by sex and age.

Methods: Colorado farm operators and their spouses were recruited in 1993 from farm truck registrations (n = 872) and between 1993 and 1997 from property value assessment lists or rural directories (n = 761). Item Response Theory was used to assess ten safety questions.

Results: Knowing fatigue causes injury best discriminated between high and low injury vulnerability; incorrectly answering the question about inattention causing injury was associated with highest vulnerability to injury. No measurement invariance was identified by sex, but those older than 65 years answered differently than those younger than 45 years (P = 0.005).

Conclusion: Safety programs emphasizing the role of fatigue and inattention on injury risk might reduce injuries in the farming community.

Author Information

From the Colorado Injury Control Research Center, Psychology Department (Drs Beseler and Stallones) and Graduate Degree Program in Public Health (Dr Stallones), Colorado State University, Fort Collins, Colo.

Address correspondence to: Cheryl L. Beseler, PhD, Research Faculty, Colorado Injury Control Research Center, Psychology Department, Colorado State University, 1879 Campus Delivery, Fort Collins, CO 80523; E-mail: cbeseler@lamar.colostate.edu.

Grant Sponsor: Centers for Disease Control and Prevention (CDC) National Institute of Occupational Safety and Health

Grant Number: U04/CCU806060

Grant Sponsor: CDC the National Center for Injury Prevention and Control

Grant Number: 1R49/CE001168

©2011The American College of Occupational and Environmental Medicine