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. 2006 Jan;23(1):12–17. doi: 10.1136/emj.2004.023028

Table 4 ED intervention at club 2. Comparison of assaults in club 2 before and after ED intervention and with seven other “hotspot” venues.

Capacity Assaults in first (preintervention) period Assaults in second (intervention) period Total assaults Event ratio 95% CI
Club 2* 1300 27 15 42 0.56 0.30 to 1.03
Club Z 1970 23 35 58 1.52 0.90 to 2.56
Club B 400 17 19 36 1.12 0.59 to 2.13
Club V 1500 8 4 12 0.50 0.16 to 1.56
Club R 400 12 8 20 0.67 0.28 to 1.59
Club S1 6000 13 6 19 0.46 0.18 to 1.17
Club E 380 9 5 14 0.56 0.20 to 1.58
Club D 910 9 4 13 0.44 0.15 to 1.36
All others† 91 81 172 0.89 0.66 to 1.20

95% CI used throughout (z = 1.96).

*Club 2 was subject only to low level police intervention.

†Club 2 versus all other clubs pooled.