Table 4

Adjusted RR for people being injured in traffic collisions in the post-intervention period compared with the pre-intervention period, regarding mean change and time trend change† between the pre and post-intervention period, according to type of vehicle. Comparison of the results obtained from the original models with those from models which include the number of new vehicle registrations as an exposure denominator. Spain 2000–6

	Men						Women
	Mean change		Trend change				Mean change		Trend change
	RR (95% CI)	p Value	Pre (%)	Post (%)	Relative change		RR (95% CI)	p Value	Pre (%)	Post (%)	Relative change
	RR (95% CI)	p Value	Pre (%)	Post (%)	%	p Value	RR (95% CI)	p Value	Pre (%)	Post (%)	%	p Value
Car users
Original model	0.88 (0.83 to 0.93)	<0.001	0.18^*	−0.19	−0.37	0.005	0.84 (0.79 to 0.90)	<0.001	0.36^*	0.13	−0.23	0.106
Exposure-adjusted model	0.61 (0.51 to 0.72)	<0.001	0.01	−3.60	−3.61	<0.001	0.60 (0.50 to 0.71)	<0.001	0.18	−3.27	−3.45	<0.001
Motorcycle users
Original model	0.95 (0.89 to 1.02)	0.146	−0.21^*	1.76^*	1.97	<0.001	0.90 (0.81 to 0.99)	0.035	−0.14	1.98^*	2.12	<0.001
Exposure-adjusted model	0.64 (0.55 to 0.73)	<0.001	−0.33^*	−1.54^*	−1.21	<0.001	0.60 (0.51 to 0.72)	<0.001	−0.27	−1.32^*	−1.05	0.003
Moped users
Original model	0.99 (0.93 to 1.04)	0.607	−0.80^*	−0.12	0.68	<0.001	1.02 (0.95 to 1.09)	0.628	−0.55^*	−0.09	0.46	0.001
Exposure-adjusted model	0.68 (0.59 to 0.78)	<0.001	−0.89^*	−3.58^*	−2.69	<0.001	0.71 (0.61 to 0.82)	<0.001	−0.69^*	−3.59	−2.90	<0.001

Post, post-intervention period; Pre, pre-intervention period. Pre-intervention period: 1 January 2000–31 December 2003; post-intervention period: 1 January 2004–31 December 2006.
↵* p<0.05.
↵† Time trends in the pre (Pre(%)) and post (Post(%)) intervention periods are expressed as the mean percentage increase/decrease in the number of people injured per month, statistically significant trends being indicated with an asterisk (*). Relative change is expressed as the mean percentage increase/decrease in the number of people injured per month in the post-intervention period compared with that in the pre-intervention period.