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Table 4 Mean security protection factor across security devices combinations

From: The effectiveness of burglary security devices

Number of devices Burglary with entry Attempted burglary Crime type ratio of mean SPFs
  Mean SPF Number of combinations Mean SPF Number of combinations  
6 86.43 2 11.16 1 7.74
4 29.84 7 12.87 6 2.32
5 29.25 5 17.31 3 1.69
3 26.82 4 15.51 3 1.73
2 11.91 4 4.18 4 2.85
1 2.05 6 1.22 6 1.68
Grand mean 31.05   10.38   3.00