Quiz: Is this a cohort study?
1000 injury-free snowboarders and 1000 injury-free skiers are studied. 8% of snowboarders and 6% of skiers, respectively, develop knee injury during the season.
In a cohort 319 developed BC 10 years after baseline. D vitamin in the blood is compared to 1260 men randomly sampled at baseline. Blood was drawn at baseline
Many kids are overweight at your kids' school. You teach about diet and exercise. You do anthropometric measures pre and 1 year post teaching