Table 1 Key characteristics of studies
Variable | Frequency | % |
|---|---|---|
Time period | ||
 1932–1999 | 3 | 9.09 |
 2000–2004 | 7 | 21.21 |
 2005–2009 | 10 | 30.30 |
 2010–2014 | 10 | 30.30 |
 2015–2018 | 3 | 9.09 |
Country | ||
 United States of America | 14 | 42.42 |
 United Kingdom | 5 | 15.15 |
 Canada | 3 | 9.09 |
 Other country | 10 | 30.30 |
 Not reported | 1 | 3.03 |
Distance measure | ||
 Euclidian | 25 | 75.76 |
 Manhattan | 3 | 9.09 |
 Euclidian and Manhattan | 5 | 15.15 |
Sample size (crimes) | ||
 1–100 | 6 | 18.18 |
 101–200 | 9 | 27.27 |
 201–500 | 4 | 12.12 |
 501–1000 | 4 | 12.12 |
 1001–2000 | 3 | 9.09 |
 2001–5000 | 4 | 12.12 |
 5000+ | 3 | 9.09 |
Total | 33 | 100 |