Table 1.

Demographic characteristics, self-rated oral health and OHIP-14 score of participants (n = 1751)

Variable	Number	Constituent ratio/%
Gender
Male	757	43.23
Female	994	56.77
Major
Stomatology major	277	15.82
Medical non-oral specialty	651	37.18
Non-medical major	823	47.00
Annual household economic income
< ¥50,000	755	43.12
¥50,000–120,000	717	40.95
> ¥120,000	279	15.93
Family origin
Rural areas	996	56.88
Urban areas	755	43.12
Educational level
Freshman	464	26.50
Sophomore	251	14.33
Junior	482	27.53
Senior	201	11.48
Graduate	172	9.82
First-year graduate	78	4.45
Second-year graduate	41	2.34
Third-year graduate	62	3.54
Only-child or not
Yes	532	30.38
Two	1027	58.65
Three	136	7.77
Four or more	56	3.20
Self-rated oral health
Very good	87	4.97
Good	224	12.79
Fair	1160	66.25
Poor	243	13.88
Very poor	37	2.11
Oral Health Impact Profile-14
Total		13.29 ± 12.15^a
Age		22.01 ± 4.83

^aMean ± SD