Inter-tester reliability of chemical health risk assessment (CHRA) method in Malaysia

Abdul Rapar, Putri Nurshahira (2017) Inter-tester reliability of chemical health risk assessment (CHRA) method in Malaysia. [Project Paper] (Submitted)

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Abstract

Introduction: CHRA is a legislative requirement for industrial workplaces involved with the use of chemical hazardous to health. It has been widely used as a mean or tool for the assessment of health risk from chemical handling or usage in order to make informed decision of control strategies. This is considering the fact that the subjective rating relies on various factors where different assessor of different background, competency or experience could gi ve rise to different outcomes. This study will determine if the results of assessment using existing me thodology are reliable. Assessment method that is reliable produces trustworthy outcomes, which gains scientific acceptance. Objectives: To determine the inter-rater reliability of CHRA's assessor assessing exposure to chemical in workplace by using exposure evaluation method in CHRA. Methodology: Five raters used the CHRA form (Form A-C) to individually assess the degree of chemical exposure of the workers in the laboratory, dipping line, chlorination and wastewater treatment plant department. Each rater assesses the frequency, magnitude and exposure of 27 chemicals based on the MSDS, workplace observation and interview with the person in-charge and workers for each department. Inter-rater reliability was analysed using Kendall's coefficient concordance and Krippendorff s Alpha-Reliability. Results: Overall alpha value was 0.58 and Kendall's coefficient of concordance (W), 0.69. The frequency rating showed the highest score of alpha (a = 0.68) and (w = 0.76) while the n1agnitude rating of estimation scores lowest alpha(a = 0.29) and (w = 0.47). Alpha values and Kendall's Tau-b showed assessors with more experienced and highest number of project conducted had high score of alpha (a = 0.62) and (n, = 0.884) Discussion and conclusion: The overall alpha values and concordance W indicates that the reliability was unreliable but has strong agreement. Lack of the reliability indicates subjective judgement affects the decision. Well-described information given increases the reliability while poor design of tools used decrease the reliability. Keywords: inter- rater reliability, expert assessment, chemical exposure, Kendall's Tau-b, Kendall's coefficient of concordance, Krippendorff's

Item Type:	Project Paper
Faculty:	Faculty of Medicine and Health Science
Depositing User:	Ms Norafizah Radzuan
Date Deposited:	05 Nov 2024 01:19
Last Modified:	05 Nov 2024 01:19
URI:	http://psaspb.upm.edu.my/id/eprint/2153

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