Welland (2011 population 50,631) is a city in the Regional Municipality of Niagara in Southern Ontario, Canada. The city is located in the centre of Niagara.
More than 5 million U.S. children, or 9.5 percent, have been diagnosed with ADHD as of 2007, according to the U.S. Centers for Disease Control and Prevention. Kids with the condition may act more impulsively, and have difficulty paying attention and controlling their behavior.
The study began with an original enrollment of 303 children, aged 3 to 5 years, who had been diagnosed with ADHD. The first stage of the study, before the drug trial, was a 10-week parent training and behavioral therapy stage.