Non-PRO Homework / test English to Spanish Medical Medical (general) article about tobacco

Second, these data apply only to children who participated in the survay on the day the surveys were administrated in schools. School response rates have been high throughout GYTS, and 21 of 395 survey sites have recorded student response rates less than 80%. Third, findings are based on self-reports from students who might under-report or over-report their behavoiur.