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This study assessed responses to the Occupational Stress Indicator in the Naperville Police Department. This 40% sample of 49 police officers were compared against population norms for employed workers in a range of occupations. Although the police officers perceived less stress from "factors intrinsic to the job", they expressed greater job-related pressure from "organizational structure and climate". They also rated greater the competitiveness and assertiveness in their work behavior.
Kirkcaldy et al. (Sat,) studied this question.