An article published in CCTV Image magazine estimates that the number of cameras in the UK is 1.85 million. The number is based on extrapolating from a comprehensive survey of public and private cameras within the Cheshire Constabulary jurisdiction. This works out as an average of one camera for every 32 people in the UK, although the density of cameras varies greatly from place to place. The Cheshire report also claims that the average person on a typical day would be seen by 70 CCTV cameras.
The Cheshire figure is regarded as more dependable than a previous study by Michael McCahill and Clive Norris of UrbanEye published in 2002. Based on a small sample in Putney High Street, McCahill and Norris estimated the number of surveillance cameras in private premises in London at around 500,000 and the total number of cameras in the UK at around 4,200,000. According to their estimate the UK has one camera for every 14 people. Although it has been acknowledged for several years that the methodology behind this figure is somewhat dubious, it has continued to be quoted in the absence of a better figure.
The CCTV User Group estimates that there are around 1.5 million CCTV cameras in city centres, stations, airports, major retail areas and so forth. This figure does not include the smaller surveillance systems such as those that may be found in local corner shops and is therefore broadly in line with the Cheshire report.
Research conducted by the Scottish Centre for Crime and Justice Research and based on a survey of all Scottish local authorities, identified that there are over 2,200 public space CCTV cameras in Scotland.
Other articles related to "prevalence":
... The prevalence of misophonia is currently unknown but groups of people identifying with the condition suggest it is more common than previously recognized ... with tinnitus, which is prevalent in 4-5% of the general population, some surveys report prevalence as high as 60% while prevalence in a 2010 study was measured at 10% ...
... The annual prevalence in the general population of chronic pelvic pain syndrome is 0.5% ... However, the overall prevalence of symptoms suggestive of CP/CPPS is 6.3% ... The prevalence of symptoms suggestive of CPPS in this selected population was 5.7% in women and 2.7% in men, placing in doubt the role of the prostate gland ...
... For example, a clear relation exists between urbanization and the prevalence of diabetes in China (diabetes defined as diabetic symptoms and a random ... environmental changes that follow urbanization are increasing the prevalence of the major risk factors for chronic disease ... The prevalence of current cigarette smoking in men (smoked in the past 30 days) was 57% in 2002, but had fallen from 63% in 1996 less than 3% of women are current smokers ...
... rates for disorders and conditions with a relatively low population prevalence or base-rate ... curve), a condition with a relatively low prevalence or base-rate is bound to yield high false positive rates, which exceed false negative rates in such a circumstance a limited positive predictive value, PPV ...
Famous quotes containing the word prevalence:
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