In one early 90 's study in Oregon , a researcher found that 300 Portland teenagers who 'd taken skid-control training in a public school program in the 1989-90 school year had a higher overall crash rate in the two years following than a group of 322 teenagers who had n't taken take the course .
Oregon /location/location/contains Portland
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Oregon
LOCATION
Portland
LOCATION
/location/location/contains