Cognitive and Behavioral Indicators of ADHD Symptoms Prior to School Age
This article reports on a longitudinal quantitative study. Longitudinal studies look at the same participants over time, in this case 6 years. The extremely large sample size (1,106 participants) and the multiple tests and measures used as data are indicators of a quantitative study. Additionally, the purpose of the study was to examine the correlational relationship between multiple variables, which also suggests a quantitative study design.