Table-II.

External Distracters.

		Mean±St. Dev.
1	Ringing cell phones	2.8±1.44
2	Students texting	2.4±1.51
3	Students using video games	2.8±1.64
4	Students using smart phones	2.2±1.54
5	Students using MP3 players	2.3±1.61
6	Students using laptops for email, surfing net	2.1±1.42
7	Students talking with others in class	3.6±1.60
8	Poor personal hygiene of other students (odors, looking dirty, etc.)	2.9±1.69
9	Students asking irrelevant questions or making irrelevant comments	3.2±1.66
10	Students making repetitive movements (tapping fingers, pen clicking, etc.)	2.9±1.53
11	Student illness symptoms (coughing, sneezing, sniffling, etc.)	2.5±1.41
12	Students arriving late	2.2±1.36
13	Students leaving early	2.0±1.39
14	Students leaving/returning to class	2.5±1.49
15	Students eating in class	2.2±1.46
16	Students drinking in class	1.7±1.31
17	Students sleeping	2.0±1.53
18	Students doing work for other courses	2.0±1.49
19	Instructor that is difficult to understand	3.5±1.62
10	Instructor exhibiting repetitive or unusual movements	2.9±1.51
21	Instructor using repetitive words or phrases	2.7±1.52
22	Furnishings (e.g., chairs, tables that are broken, dirty, etc.)	2.7±1.60
23	Classroom odors equipment problems (e.g., malfunctioning computers)	3.2±1.67
24	Temperature (too hot/cold)	3.5±1.63