IRCT20151103024859N2 IRCT 2018-11-15 Iran University of Medical Sciences Investigating of the effect of education on workers' noise annoyance KAP Investigation of the effect of education on workers' noise annoyance 2018-10-23 anticipated 170 Complete https://irct.ir/trial/33199 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Randomization description: At first, for blinding,groups 1 and 2 were selected from two different shifts. On both shifts, the names of the people were first sorted according to their staff numbers. Then by using extant software in the internet which is used for random work, the first groups, on first shift workers including 103 people 85 ones are simply randomly selected without any alternatives. Also, the second group, on second shift workers, which consist of 113 people, was randomly assigned to 85 individuals. Then the numbers were matched with the staff numbers of the workers, and the samples were selected. The intervention and control groups are chosen by tossing up. The letters A and B were attributed to them. in this way groups A, the first group ,is chosen as the intervention group and group B, the second group , is chosen as the control group, Blinding description: The two groups don’t interfere with each other. 85 of Shift 1 and 85 of Shift 2 are selected. The control group is not informed about the existence of the training. N/A noise annoyance due to occupational exposure to noise. Intervention 1: intervention group :On first shift; those parts of the factory which are exposed to noise over 85 dB, 85 workers are randomly chosen by draw, based on the workers numbers.After describing the procedure and purpose of research, their consents are filled out. If the worker doesn’t want to participate in the study, sampling will continue until the sampling size is completed in the intervention group.After completing the questionnaires (the knowledge, attitude and practice questionnaire, noise annoyance questionnaire), audiometry is done by the researcher in the studied sampler.After performing a pretest, the data is entered into the statistical software.Based on pretest results, designing of educational intervention and media will be required.Educational intervention that is likely to be in the form of 3 to 4 sessions of group discussion and lectures.After the training classes for the intervention group workers, two months after the intervention, both groups are followed up, and questionnaires are completed again for them.In the same way, of the workers of the other shift (who do not usually contact each other), 85 people will be selected as a control group. Intervention 2: control group : Among other shift workers who are exposed to noise over 85 dB, 85 workers are randomly chosen by draw.The choice is based on their worker numbers.Similar to the intervention group, questionnaires (knowledge, attitude, practice questionnaire, noise annoyance questionnaire) are completed by selected workers. Audiometry is done by the researcher in the studied sampler.After the pretest, the information of both groups is entered into the statistical software for designing is entered into the statistical software for designing of the educational intervention and the required media. The control group doesn’t receive any training.Two months later, the control group will completed the relevant questionnaires, again. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is The company information file is confidential.