Development and testing of an instrument to measure contextual factors influencing self-care decisions among adults with chronic illness

Table 1 I-CVI and clarity data by Delphi round

	# of experts	# of items in round	I-CVI^a range	% of I-CVI ≥ 0.78^b	Clarity^c range	Items rated as clear by < 75% of experts^d	Items deleted or added in round
Round 1	12	41	0.5 – 1.0	95%	42–100%	12 items	9 deleted 5 added
Round 2	12	37	0.83—1.0	100%	75–100%	0 items	2 added

^aItem Content Validity Index (I-CVI) = number of respondents who rated the item as ‘highly relevant’ or ‘quite relevant’ divided by total number of respondents
^bAn I-CVI of 0.78 or higher indicates good content validity at the item level
^cClarity = number of respondents who rated the item as clear divided by the total number of respondents
^dItems rated as clear by less than 75% of experts required revision

ISSN: 1477-7525