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. 2009 Mar 18;87(7):497–504. doi: 10.2471/BLT.08.051847

Table 2. Relative risk of being injured on the road, and attributable fraction, since the passing of law allowing experienced car drivers to drive light motorcycles, by type of vehicle, Barcelona, Spain, 1 January 2002 to 30 April 2008.

Period Motorcycle
Moped
Car
Light (EC 51–125 cc)
Heavy (EC > 125 cc)
(EC  50 cc)
RRa (95% CI) AF % No. RRa (95% CI) AF % No. RRa (95% CI) AF % No. RRa (95% CI) AF % No.
Entire post-law period 1.46 (1.34–1.60) 32 2 091 1.15 (1.02–1.29) 13 682 0.92 (0.83–1.01) –9 –654 1.06 (0.97–1.16) 6 676
1 year after law 1.18 (1.07–1.29) 15 226 1.19 (1.09–1.42) 16 216 0.96 (0.86–1.07) –4 –94 1.03 (0.93–1.14) 3 111
2 years after law 1.38 (1.26–1.50) 28 477 1.31 (1.20–1.42) 24 352 0.90 (0.78–1.04) –11 –225 1.01 (0.88–1.15) 1 34
3 years after law 1.68 (1.55–1.83) 40 858 1.31 (1.20–1.42) 24 352 0.93 (0.78–1.12) –8 –151 1.00 (0.84–1.19) –1 –32
3 years and 7 months after law 1.77 (1.59–1.96) 44 566 1.37 (1.23–1.52) 27 244 1.02 (0.81–1.28) 2 24 0.92 (0.74–1.15) –9 –138

AF, attributable fraction; CI, confidence interval; EC, engine capacity; RR, relative risk.
a In time-series analysis with Poisson regression models.