Psychological impact of cancer scale: Turkish validity and reliability study

Table 1 Results of the Kaiser–Meyer–Olkin measure of sampling adequacy and Bartlett’s test of Sphericity

Tests		Test results
KMO		0.799
Bartlett Sphericity Test	χ2	2310.44	P < 0.001
	SD	66
	P value	0

Table 2 Exploratory factor analysis results of Psychological Impact of Cancer Scale

Scale items	Communality	Corrected item-total correlations	Cronbach’s alpha if item deleted	Factor load values
				F1	F2	F3	F4
Item 8	0.909	0.411	0.839	0.943
Item 10	0.894	0.492	0.834	0.917
Item 11	0.848	0.454	0.837	0.888
Item 2	0.887	0.511	0.7		0.833
Item 6	0.87	0.538	0.7		0.83
Item 7	0.879	0.556	0.7		0.829
Item 1	0.887	0.46	0.68			0.837
Item 4	0.836	0.635	0.67			0.827
Item 9	0.882	0.536	0.5			0.831
Item 3	0.798	0.543	0.67				0.83
Item 5	0.764	0.51	0.66				0.833
Item 12	0.812	0.54	0.66				0.831
Eigenvalue	-	-	-	2.686	2.587	2.52	2.406
Total explained variance (%) = 84.98%	-	-	-	22.382	21.555	21.001	20.051

Table 3 Confirmatory factor analysis results

Fit criteria	Found	Appropriate	Acceptable	Result
χ2/df	2.47	< 2	< 5	Perfect fit
RMSEA	0.076	< 0.05	< 0.08	Acceptable fit
CFI	0.97	> 0.95	> 0.90	Perfect fit
NFI	0.95	> 0.95	> 0.80	Acceptable fit
IFI	0.97	> 0.95	> 0.90	Perfect fit
RMR	0.034	< 0.05	< 0.08	Perfect fit
SRMR	0.059	< 0.05	< 0.08	Acceptable fit
GFI	0.92	> 0.95	> 0.90	Acceptable fit
AGFI	0.88	> 0.95	> 0.85	Acceptable fit
PGFI	0.56	> 0.89	> 0.50	Acceptable fit
PNFI	0.68	> 0.89	> 0.50	Acceptable fit

CFI: Comparative fit index; RMSEA: Root mean square error of approximation; RMR: Root mean square residual; NFI: Normed fit index; IFI: Incremental fit index; SRMR: Standardized root mean square residual; GFI: Goodness of fit index; AGFI: Adjusted goodness of fit index; PGFI: Parsimony goodness of fit index; PNFI: Parsimony normed fit index.

Table 4 Correlations between factors, mean scores and reliability results

Factors	α	AVE	CR	mean ± SD	Test-retest (r)
F1	0.93	0.89	0.96	2.57 ± 0.66	0.951
F2	0.914	0.78	0.91	2.32 ± 0.85	0.992
F3	0.899	0.77	0.91	2.69 ± 0.71	0.904
F4	0.86	0.67	0.86	2.66 ± 0.80	0.993
PICS total	0.844	-	-	2.56 ± 0.50	0.923

α: Cronbach Alpha Coefficient; r: Correlation; AVE: Average variance extracted; CR: Construct Reliability; PICS: Psychological Impact of Cancer Scale.