Join Date: Aug 2008
Location: Ikea Town, NorCal
If it's a US statistic, I'd say it's because opposing traffic's on the left and, thus, crossover accidents are gonna hit you there. Even in "turning left in front of a motorcyclist" accidents, motorcyclists're more likely to head to the right as an escape route ('cause with the left you know there's traffic), thereby putting the left leg between the bike and the car. Also, left handers are faster corners (by virtue of how our roads are setup) and, thus, low sides are going to happen at greater speeds when you're leaned to the left, getting your leg caught between the bike and the ground, resulting in injury.
If it's a worldwide statistic, I dunno.