Limitation
Limitation of this study is the farmers may not truly answer with understand the questionnaires regarding knowledge attitude and practice for example, some farmers may think that in appropriated use of PPE is correct practices. Those answers may result in the interpreted between KAP and cholinesterase level.
The design of this study was a cross sectional study; only Tha-Chai and Nang Lue sub - district in Chai Nat province was conducted. Moreover, it is better to recruit more subjects in several rice farming areas in the country.