Contextualizing the revised Patient Perception of Patient-Centeredness (PPPC-R) scale in primary healthcare settings: a validity and reliability evaluation study

Table 1 Calculation of I-CVI, Clarity, and CVR for 21-item PPPC-CN items (n=7)

Item	Round 1 assessment based on scale-v3						Round 2 assessment based on scale-v4						Face validity
Item	N_i^a	I-CVI^b	K of I-CVI^c	N_c^d	N_e^e	CVR^f	N_i^a	I-CVI^b	K of I-CVI^c	N_c^d	N_e^e	CVR^f	IIS ^g
1	7	1.00	1.00	3	7	1.00	7	1.00	1.00	7	7	1.00	2.00
2	6	0.86	0.85	5	6	0.71	7	1.00	1.00	6	7	1.00	3.00
3	6	0.86	0.85	6	7	1.00	7	1.00	1.00	6	5	0.43	2.80
4	7	1.00	1.00	5	6	0.71	7	1.00	1.00	6	7	1.00	3.00
5	7	1.00	1.00	6	5	0.43	7	1.00	1.00	6	7	1.00	2.80
6	7	1.00	1.00	6	7	1.00	7	1.00	1.00	6	7	1.00	3.60
7	7	1.00	1.00	7	6	0.71	7	1.00	1.00	7	7	1.00	1.50
8	7	1.00	1.00	7	6	0.71	7	1.00	1.00	6	7	1.00	1.00
9	7	1.00	1.00	5	7	1.00	7	1.00	1.00	5	6	0.71	3.10
10	7	1.00	1.00	5	7	1.00	7	1.00	1.00	6	7	1.00	2.90
11	7	1.00	1.00	6	6	0.71	7	1.00	1.00	7	7	1.00	3.70
12	7	1.00	1.00	2	5	0.43	7	1.00	1.00	6	7	1.00	2.20
13	6	0.86	0.85	4	4	0.14	7	1.00	1.00	6	7	1.00	2.70
14	7	1.00	1.00	5	7	1.00	6	0.86	0.85	6	6	0.71	2.70
15	7	1.00	1.00	7	5	0.43	7	1.00	1.00	7	6	0.71	1.90
16	6	0.86	0.85	4	6	0.71	7	1.00	1.00	7	6	0.71	2.00
17	7	1.00	1.00	6	3	-0.14	6	0.86	0.85	5	6	0.71	1.50
18	7	1.00	1.00	5	7	1.00	6	0.86	0.85	7	7	1.00	2.00
19	7	1.00	1.00	6	7	1.00	6	0.86	0.85	6	6	0.71	1.40
20	7	1.00	1.00	6	7	1.00	6	0.86	0.85	6	7	1.00	2.10
21	6	0.86	0.85	6	6	0.71	7	1.00	1.00	7	7	1.00	2.80

Abbreviations: I-CVI Content Validity Index, CVR Content Validity Ratio, IIS Item Impact Score
^aN_i, the number of panelists who rated 3 or 4 out of 4 points, supporting the item's relevance
^bInterpretation of I-CVIs: The item would be appropriate if the I-CVI is higher than 79 percent. If it is between 70 and 79 percent, it needs revision. If it is less than 70 percent, it should be eliminated
^cAdjusted Kappa, K=(I-CVI-P_c)/(1-P_c) [P_c (probability of a chance occurrence) was computed using the formula: P_c=[N!/A!(N-A)!]×0.5^N, where N=number of experts=7, and A=number of panelists who agreed that the item is relevant=N_i.] Interpretation of K of I-CVI, values above 0.74, between 0.60 and 0.74, and between 0.40 and 0.59 are considered as excellent, good, and fair, respectively
^dN_c, the number of panelists who rated 3 or 4 out of 4 points, supporting the clarity of the expression of the item
^eInterpretation of item impact score. The item would be eliminated when the score is less than 1.5
^fN_e, the number of panelists who rated 3 out of 3 points, supporting the item's necessity
fInterpretation of CVR: if CVR is greater than 0.99, the item would remain at the instrument, and the rest should be eliminated
^gIIS=frequency (the percent of patients who scored 4 or 5 out of 5 on the item importance)×importance (mean important score of the item). If the IIS of the item≥1.5, it would be maintained in the instrument; otherwise, it should be eliminated

ISSN: 2731-4553