الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
This study was conducted in Stia Textile Factory at EI-Hadara in Alexandria, to evaluate the psychological condition of workers exposed to noise and/or working variable shift’ pattern system. A pilot survey was first undertaken. In this survey, all workers exposed to industrial noise in the spinning and weaving of cotton and wool units were interviewed using a special designed questionnaire. This was intended primarily for the selection of the sample of this study. A sample of 700 workers was chosen. It included four groups of workers i.e. group I (121 workers) ~ workers who were exposed to industrial notse and shift; group 11 (20 workers), workers who worked only dailY worked on varying noise; group III shift pattern without exposure to industrial (379 workers) those exposed to noise and work ing on a varying shift pattern; group IV (180 workers) those who were an continuous daily shift without ’exposure to industrial noise (control group). The chosen population was of the same socio-economic conditions and of the same sex as those of the control group. All workers were mal~s, married and having children. All of them were from the urban area, of approximately the same level of education (read and write). The daily income per capita was approximately the same, compared with the controls. Workers exposed to noise in other jobs or near their houses were excluded as well as workers suffering or were suffering from occupational injuries or accidents. Noise intensity was measured in the different sections where the examined population Was chosen. A~band noise intensity levels were measured at the hearing level of the workers. Exposure to ccntinua~s naise was expressed by the product of the naise intensity tfdBAII and the exposure duration. This was termed noise emission level IIEAn and was expressed in decibel. Noise emission levels to which workers were exposed vari ed between 85 to 115 db. The sa,mple of workers was submitted tQ psychological tests. These tests were intended for the ~tudy of concentration power, aggressien and paranoid tendencies. Five tests were used to These are the digit span, estimate the ability to c~ncentrate. digit-symbol memory) digit-symbol concentration, ball and stick cancellation and T.X.O.l. cancellation tests. The Hand and the M.M.P.I. tests were used ~or estimation aggression and paranoid tendencies. Results obtained showed that workers exposed to industrial n~ise and working variable shift pattern showed a reduction in the concentration ability compared to the controls. This was also noti&ed but to a lesser extent among those exposed to noise and working daily shift and among those working variable shift pattern without exposure to noise. This reduction in concent ration ability’ was not manifested in case of workers exposed to noise and worked only daily shift, as well as those-who worked on varying shift patt9rn without exposure to industrial noise by using the digit span test as this test measures the concent ration ability depending on hearing acuity. Also insignificant r.esults were obtained when ~ompared to the controls by using the ball and stick cancellation test in case of workers exposed to noise and worked only daily shift, as well as those who worked ~n varying shift pattern without exposure to industrial noise. This is due to the fact that this test although it measur9s coneentration depends primarily on comprehension. Noise exposure with or without shift pattern increases ~ggressi.n. system. This effect is independent of:, type of work shift Noise exposure and work shift system increases the para, noid tendency among exposed workers. Concentration ability, aggression and paranoid tenden cies were affected by noise exposure but have no relation to the degree of its intensity or to the exposure duration (noise emission lovel). ^leng