Table I.

Characteristics of the investigated teachers, objective evaluation of the vocal folds and larynx by means of VLS and the subdivision into groups proposed by a team of speech pathologists and medical doctors.

Subject	Gender	Age	Number of monitored workdays	Subject taught	Self-reported hearing condition	VLS	Group
1	Female	37	1	Math	No	nodules	1
2	Female	34	1	Math	No	nodules	1
3	Female	42	1	Italian	-	nodules and cysts	1
4	Female	54	1	Italian	Yes	bilateral nodules	1
5	Female	54	2	Italian	No	normal physiology	2
6	Female	49	1	Italian	Yes	hypercontraction	2
7	Male	59	2	Italian	No	vocal fold hyperemia	2
8	Male	43	2	Math	No	normal physiology	2
9	Female	58	2	Italian	No	normal physiology	2
10	Female	33	2	Math	No	normal physiology	2
11	Female	40	2	Math	No	hypercontraction	2
12	Female	47	1	Italian	-	normal physiology	2
13	Female	54	2	Italian	Yes	vocal fold hyperemia	2
14	Female	43	2	Italian	No	hypotonia	2
15	Female	58	1	Math	No	normal physiology	2
16	Female	34	2	Math	No	normal physiology	3
17	Female	55	2	Math	No	normal physiology	3
18	Female	52	2	Math	No	normal physiology	3
19	Female	38	2	Math	No	normal physiology	3
20	Female	56	2	Italian	Yes	normal physiology	3
21	Female	34	2	Italian	-	normal physiology	3
22	Female	39	2	English	No	normal physiology	3
23	Female	35	1	Italian/ Math	No	hypercontraction	3
24	Female	31	1	Italian	No	normal physiology	3
25	Female	40	2	Italian	Yes	hypercontraction	3
26	Female	38	2	English	Yes	normal physiology	3

Group 1 consists of subjects with structural voice disorders, Group 2, subjects with subjectively or functionally reported symptoms, and Group 3, with normal physiology.

Math = Mathematics.