Originally Posted by prathmann

Of course the statistics only represent those who seek professional medical care after a crash. Those under 19 are more likely to still live with parents who want to have a doctor check out their injured child and those over 25 are likely to have a spouse with similar concerns. The 20-24 group is more likely to be living alone (or with less concerned roommates) and may be less likely to seek treatment for minor injuries that they expect to heal on their own.

Another consideration is that the figure is dealing with very low numbers (2 injury cases for 20-24 year olds vs. 10 cases for 25-29) so random fluctuations can be significant.