... to the nearest hundred thousandth of a degree using a global positioning system (GPS) device (eTrex Venture; Garmin International Inc., Olathe, KS). ... Seven school sites (10%) were randomly selected to be assigned to two different data-collection teams for quality- control purposes. ... Coders were trained and given detailed written instructions and descriptions of all codes before content coding.
|Title||:||Journal of Studies on Alcohol and Drugs|