Table 2.

Weekly number of tweets posted during nonexam and exam periods by participants, by sex, ethnicity, and area of study.

Characteristics		Nonexam period (weeks 1-8)			Exam period (weeks 9 and 10)
		Mean	SEa	Range	Mean	SE	Range
Sex
	Female	14.7	11.9	0-90	14.9	2.1	0-98
	Male	12.8	13.0	0-148	10.8	2.2	0-96
Ethnicity
	White	7.0	2.3	0-77	7.6	2.7	0-83
	African American	23.4	5.9	0-93	17.5	3.3	0-95
	Latino	19.0	14.0	0-148	17.3	4.2	0-84
	Asian	10.5	12.8	0-114	9.8	2.6	0-94
	Other minorities	12.3	12.8	0-48	15.8	5.3	0-98
Area of study
	Health science	14.3	12.4	0-113	14.6	2.3	0-94
	Business	16.1	7.4	0-93	14.4	7.2	0-92
	Mathematics and engineering	9.1	2.1	1-33	8.3	1.9	0-31
	Social science and arts	19.0	5.3	0-148	16.8	4.0	0-98
	Undeclared	11.1	3.4	0-88	9.4	3.6	0-95

^aSE: standard error.