Table 1. Characteristics of study participants

Code	Gender	Age	Marital status	Academic level	Profession	Place	Stuttering detection time
N1	Male	29	Not married	University	Jewelry designer	Ha Nam	4 years old
N2	Male	29	Not married	After university	Office staff	HCM city	In elementary school
N3	Male	26	Not married	University	Office staff	HCM city	At 3rd grade
N4	Male	27	Not married	University	Mechatronics Engineer	Phu Yen	5 years old
N5	Male	31	Married	University	Officer	Phu Yen	20 years ago
N6	Male	24	Married	University	Accountant	Vinh Yen	Child
N7	Female	24	Not married	University	Medical staff _	HCM city	6th grade