Development and evaluation of the content validity, practicability and feasibility of the Innovative dementia-oriented Assessment system for challenging behaviour in residents with dementia

Table 10 Content validity of the dimension “Communication”

		Relevance of the questions						Clarity of the questions						Meaningfulness of the answers						Completeness of the answers
No	Content of the items	Number of experts	Number of ratings of 3 or 4	I-CVI^a	p_c ^b	k* ^c	Evaluation^d	Number of experts	Number of ratings of 3 or 4	I-CVI^a	p_c ^b	k* ^c	Evaluation^d	Number of experts	Number of ratings of 3 or 4	I-CVI^a	p_c ^b	k* ^c	Evaluation^d	Number of experts	Number of ratings of 3 or 4	I-CVI^a	p_c ^b	k* ^c	Evaluation^d
1	To express oneself verbally	10	10	1.00	0.001	1.00	****	10	10	1.00	0.001	1.00	****	10	8	0.80	0.044	0.79	****	10	8	0.80	0.044	0.79	****
2	To understand verbal communication	10	9	0.90	0.010	0.90	****	10	7	0.70	0.117	0.66	***	10	7	0.70	0.117	0.66	***	10	7	0.70	0.117	0.66	***
3	To understand written language	10	7	0.70	0.117	0.66	***	9	7	0.78	0.070	0.76	****	9	6	0.67	0.164	0.60	***	9	7	0.78	0.070	0.76	****
4	Hearing	10	10	1.00	0.001	1.00	****	10	10	1.00	0.001	1.00	****	10	9	0.90	0.010	0.90	****	10	9	0.90	0.010	0.90	****
5	Vision	10	10	1.00	0.001	1.00	****	10	10	1.00	0.001	1.00	****	10	8	0.80	0.044	0.79	****	10	9	0.90	0.010	0.90	****
6	Communication of wishes and needs	10	10	1.00	0.001	1.00	****	10	10	1.00	0.001	1.00	****	10	10	1.00	0.001	1.00	****	9	8	0.89	0.018	0.89	****
		S-CVI/AVE 0.93						S-CVI/AVE 0.91						S-CVI/AVE 0.81						S-CVI/AVE 0.83
		S-CVI/UA 0.67						S-CVI/UA 0.67						S-CVI/UA 0.16						S-CVI/UA 0.00

^a I-CVI (content validity index) = number of experts providing a rating of 3 or 4/number of experts
^b p_c (probability of chance occurrence) = [N!/A!(N-A)!] × 0.5^N, N = number of experts; A = number of experts agreeing on a rating of 3 or 4
^c k* (modified kappa) = (I-CVI-p_c)(1-p_c)
^d Evaluation criteria for the level of content validity: relationship between I-CVI and k*; excellent validity = I-CVI ≥ 0.78 and k* >0.74 (****); good validity I-CVI < 0.78 and ≥ 0.60 and k* ≤0.74 (***); fair validity I-CVI < 0.6 and ≥ 0.40 and k* ≤0.59 (**); poor validity I-CVI < 0.4 and k* <0.40 (*)

ISSN: 1472-6963