Table 4.

Item discrimination and reliability analysis of COHIP-SF 19 JP (n = 379)

Subscale	No.	Content	Item-test correlation	Item-rest correction	Alpha if item deleted
Oral Health	Q1	Had pain in your teeth/toothache	0.45	0.36	0.76
	Q2	Had crooked teeth or spaces between your teeth	0.55	0.43	0.76
	Q3	Had discolored teeth or spots on your teeth	0.54	0.42	0.76
	Q4	Had bad breath	0.56	0.46	0.75
	Q5	Had bleeding gums	0.36	0.23	0.77
Functional well-being	Q9	Had difficulty eating foods you would like to eat	0.44	0.35	0.76
	Q13	Had trouble sleeping	0.31	0.26	0.77
	Q17	Had difficultly saying certain words	0.34	0.24	0.77
	Q18	Had difficulty keeping your teeth clean	0.48	0.37	0.76
Socio-emotional well-being	Q6	Been unhappy or sad	0.62	0.55	0.75
	Q7	Missed school for any reason	0.08	0.04	0.78
	Q8	Been confident	0.24	0.09	0.79
	Q10	Felt worried or anxious	0.61	0.53	0.75
	Q11	Not wanted to speak / read out loud in class	0.41	0.30	0.77
	Q12	Avoided smiling or laughing with other children	0.58	0.51	0.76
	Q14	Been teased, bullied, or called names by other children	0.32	0.26	0.77
	Q15	Felt that you were attractive (good-looking)	0.23	0.10	0.78
	Q16	Felt that you look different	0.63	0.56	0.75
	Q19	Been worried about what other people think about your teeth, mouth, or face	0.68	0.60	0.74