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This research was a mixed method study with the aims and objective of 1) To study the correlation of agricultural chemical usage behavior with cholinesterase enzyme levels in the blood of farmers, and 2) To study factors related with the agricultural chemical usage behavior and cholinesterase enzymes levels in blood of farmers. The samples were comprised of 84 farmers who had risky or unsafe blood results. Data were collected by using questionnaires, in-depth interviews, and group discussions during 1–30 September 2017. The data were then analyzed by using frequency, percentage, mean, standard deviation, Chi-square analysis, Pearson’s Product Moment Correlation Coefficient, and predictive influences with multiple regression statistics. Referring to qualitative research, data were analyzed by means of the content analysis method to summarize the topics and issues to cover the data. The result this research showed that the behavior of farmers who had used agricultural chemicals affecting the level of cholinesterase enzymes level in blood as follows: the farmers had right behavior practice regularly at 63.1%; they had right behavior, but practice not regularly. at 31.0%, and had incorrect behavior at 6.0% respectively. The factors related to the agricultural chemical usage behavior and cholinesterase enzymes level in blood of farmers were statistically significant (P-value<.05), including the types of farming, monthly income and a number of days spent using chemicals, the knowledge of using agricultural chemicals, and the attitudes towards using agricultural chemicals. Additionally, fhe factors influencing and predicting the agricultural chemical usage behaviors and cholinesterase enzymes level in blood of farmers were statistically significant (P-value<.05) They were shown at predicting at 20%, including the monthly income, marital status and type of agriculture. The results of this study suggest that public health executives should conduct public relations about correct self-use of behaviors when using chemicals so that farmers can adapt their attitudes when using agricultural chemicals.
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