Table 3.

Range, mean, and standard deviation (SD) of questionnaire responses (n=12).

	Range	Mean	SD	Mean rating label*
Workload
Physical effort	1–7	2.83	2.08	3: Somewhat low
Mental effort	1–6	4.83	1.47	5: Somewhat high
Time pressure	1–5	2.75	1.87	3: Somewhat low
Frustration	1–7	3.75	1.91	4: Neither high nor low
Overall workload	1–6	3.17	1.64	3: A little hard
Comfort
Headache	1–1	1.00	.00	1: Not at all painful
Eyes	1–5	2.33	1.30	2: Scarcely tired, strained or painful
Facial muscles	1–4	1.58	1.17	2: Scarcely tired, strained, or painful
Neck	1–4	1.67	1.07	2: Scarcely tired, stiff, or painful
Overall comfort	1–5	3.42	1.24	3: Somewhat comfortable
Ease of use
Accuracy	2–7	3.75	1.71	4: Neither accurate nor inaccurate
Speed	1–5	3.08	1.08	3: Somewhat fast
Overall satisfaction
Overall satisfaction	1–6	3.17	1.47	3: Somewhat satisfied

^*Mean rating label is the rating scale label associated with the integer nearest to the mean.