<P> This was upheld for 12 months, from 1 October 1972 to 30 September 1973 . </P> <P> Victim surveys, reported crime rates, arrest data, a survey of local businesses, attitudinal surveys, and trained observers who monitored police - citizen interaction were used to gather data . These were taken before the start of the experiment (September 1972), and after (October 1973), giving' before' and' after' conditions for comparison . </P> <Ol> <Li> Citizens did not notice the difference when the frequency of patrols was changed . </Li> <Li> Increasing or decreasing the level of patrol had no significant effect on resident and commercial burglaries, auto thefts, larcenies involving auto accessories, robberies, or vandalism--crimes . </Li> <Li> The rate at which crimes were reported did not differ significantly across the experimental beats . </Li> <Li> Citizen reported fear of crime was not affected by different levels of patrol . </Li> <Li> Citizen satisfaction with police did not vary . </Li> </Ol> <Li> Citizens did not notice the difference when the frequency of patrols was changed . </Li>

Findings of the kansas city preventive patrol experiment
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