Workers samples
The current study was conducted on a group of workers who worked in thirteen various types of
factories distributed in several locations in Duhok city. The samples of this study were ninety workers,
distributed in these different factories or industries (Table 1). Daily working hours are between (4-12h/d),
workers are given (1h) lunch break excluding the work time of (8-12h/d). The sample‟s ages were between (14-
55) years.