Table 2. Participants, biographical data.

Id	Group	Gender	Age	Handednessscores	Stuttering severity score,SSI-3	Stuttering severitylabel
1	St	m	43	100	15	Very mild
2	St	m	20	33	32	Severe
3	St	m	35	100	18	Mild
4	St	m	35	100	43	Very severe
5	St	m	25	100	37	Very severe
6	St	m	21	100	18	Mild
7	St	m	21	−100	25	Moderate
8	St	f	22	100	7	Very mild
9	St	m	21	100	missing	missing
10	St	m	20	100	38	Very severe
11	St	m	44	100	31	Moderate
12	St	m	25	100	11	Very mild
13	St	m	47	100	23	Mild
14	St	m	47	100	25	Moderate
15	St	m	24	100	4	Very mild
16	C	m	28	100
17	C	m	22	100
18	C	m	23	100
19	C	f	26	−100
20	C	m	21	75
21	C	m	26	100
22	C	m	25	100
23	C	m	22	75
24	C	m	27	100
25	C	m	46	100
26	C	m	33	100
27	C	m	52	100
28	C	m	21	100
29	C	m	51	100
30	C	m	20	100

St = Stuttering; C = Control group; m = male, f = female. Stuttering severity was estimated using the Stuttering Severity Instrument-3, SSI-3 [16], Handedness score based on item 1, 2, 3, 6, and 7 from the Edinburgh Handedness Inventory [17].