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Table 10 Content validity of the dimension “Communication”

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

  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-CVIa pc b k* c Evaluationd Number of experts Number of ratings of 3 or 4 I-CVIa pc b k* c Evaluationd Number of experts Number of ratings of 3 or 4 I-CVIa pc b k* c Evaluationd Number of experts Number of ratings of 3 or 4 I-CVIa pc b k* c Evaluationd
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    
  1. a I-CVI (content validity index) = number of experts providing a rating of 3 or 4/number of experts
  2. b pc (probability of chance occurrence) = [N!/A!(N-A)!] × 0.5N, N = number of experts; A = number of experts agreeing on a rating of 3 or 4
  3. c k* (modified kappa) = (I-CVI-pc)(1-pc)
  4. 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 (*)