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Table 3 SPFs and NIEs of burglary with entry and attempted burglary across security devices configurations (2008/2009–2011/2012 CSEW)

From: The effectiveness of burglary security devices

Security devices Burglary with entry Attempted burglary
  SPF NIE SPF NIE
WD 12.54** 3.17 7.56** 2.23
EWD 34.41** 22.03 13.93** 6.62
WSD 32.30** 20.87 7.63** 0.99
EWBD 16.49** 3.21 7.61** −0.34
EWSD 31.45** 17.02 17.53** 8.90
EIWBD 29.62** 12.84 10.77** 1.35
EIWD 49.12** 33.23 21.78** 13.00
WBD 8.92 −1.35 5.81 −0.15
IWD 16.54** 3.66 24.96** 18.17
EIWSBD 138.85** 120.01 11.16** 0.43
EWSBD 32.44** 17.11 9.04** −0.23
EIWSD 28.36** 10.42 32.11** 22.01
WSBD 18.66** 6.34 8.50* 1.22
WS 12.64** 4.01 4.06 −1.24
EW 17.76** 8.18 6.19 0.22
IWBD 18.24** 4.47 10.33* 2.89
IWSD 23.04** 8.11 11.47** 3.35
SD 7.67 2.83 3.14 0.48
IWSBD 23.41** 7.59 5.44 −3.31
ED 10.77 4.97 0.69 −0.62
WB 4.68* −2.79 3.26 −1.36
EWS 14.15 2.51 4.38 −2.91
EWB 10.25 −0.24 2.55 −4.06
EIW 13.20 0.11 13.79 6.36
ESD 15.30 7.45 8.88 4.24
CWD 24.01* 13.04 12.55 6.23
CEIWBD 34.00* 15.63 5.92 −4.48
IW 8.33 7.74 7.74 2.29
CEWD 3.23 −5.07
CEWBD 32.44* 17.57 3.77 −5.17
BD 1.96** −1.72 1.01** −0.97
CWSD 51.90* 38.88 18.08 10.45
EIWB 11.52 −2.47 2.29 −5.78
WSB 13.87 4.34 2.42 −3.52
EBD 6.71 0.02 2.34 −1.63
ID 9.62 3.32 2.23 −0.57
EWSB 12.68 0.14 3.31 −4.61
CEWSBD 6.39 −3.86
EID 9.17 −0.13 6.39 1.60
ES 4.54 −0.52 1.84* −1.46
EIWS 3.58 −5.17
CW 14.54 6.37 10.13 5.16
CWBD 4.99 −1.97
IWS 5.10 −7.04 8.88 2.12
IWB 6.26 −4.72 4.36 −1.72
  1. *0.05>P⩾0.01; **P⩽0.01.
  2. Abbreviations: B=Burglar alarm; C=CCTV; D=Door double or deadlocks; E=External lights on a timer or sensor switch; I=Indoor lights on a timer or sensor switch; S=Security chains; W=Window locks.
  3. Notes: Results are given in descending order of sample size that reported each configuration; configurations not reported by victims at the time of first burglary cannot produce SPFs.