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Table 2 Statistical models describing intervention effects on city-wide taxicab driver homicide rates: United States, 1996—2010

From: Cities with camera-equipped taxicabs experience reduced taxicab driver homicide rates: United States, 1996–2010

  Model 1* Model 2 † Model 3 §
  Unadjusted Adjusted Unadjusted Adjusted Unadjusted Adjusted
  RR (95% CL) RR (95% CL) RR (95% CL) RR (95% CL) RR (95% CL) RR (95% CL)
Variables       
Cameras installed 0.22 (0.10, 0.52) 0.11 (0.06, 0.24) 0.31 (0.14, 0.72) 0.32 (0.15, 0.67) — —
Partitions installed — — — — 1.11 (0.59, 2.09) 0.78 (0.41, 1.47)
Year — 1.09 (1.00, 1.19) — 0.98 (0.92, 1.04) — 0.88 (0.83, 0.94)
City homicide rate** — 1.10 (1.01, 1.20) — 1.12 (1.03, 1.23) — 1.12 (1.06, 1.19)
  1. *Rate ratio of taxicab driver homicide rates post-installation versus pre-installation of cameras.
  2. †Rate ratio of taxicab driver homicide rates in camera cities compared to control cities.
  3. §Rate ratio of taxicab driver homicide rates in partition cities compared to control cities.
  4. The rate ratio represents an associated change in taxicab driver homicide rate for every increase of 1 year.
  5. **The rate ratio represents an associated increase in taxicab driver homicide rate for every 1 unit increase in city homicide rate.
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