Table 2.

Topics and descriptions.

Topics	Description	Example keywords used for search	Number of tweets on ADHDa	Number of tweets on non-ADHD
Concentration ability	Whether users are capable of focusing on a task	Focus, focused, task, attention, productive	21,340	23,109
Time management	How users organize and plan to split time between different tasks	Priority, organize, prioritize, planning	16,541	12,280
Sleeping issues	Irregular sleep-awake rhythm	Sleep, insomnia, restless, awake, sleepy	15,850	8483
Drug abuse	Addiction to drugs	Drug, addiction, meth, smoking, nicotine	10,190	9632

^aADHD: attention-deficit/hyperactivity disorder.