Concurrent validity of kidney transplant questionnaire in US renal transplant recipients

Figures & data

Table 1 Demographic characteristics (n = 100)

Characteristic	Frequency (%)
Mean age ± SD, years	51.0 ± 13.2
Gender
Male	52 (52)
Female	48 (48)
Education
Less than high school	17 (17)
High school graduate	23 (23)
Some college/associate degree	35 (35)
College graduate or higher	20 (20)
Other	2 (2)
Missing data	3 (3)
Employment status
Employed	33 (33)
Not employed	65 (65)
Missing data	2 (2)
Marital status
Not married	59 (59)
Married	41 (41)
Race
White	50 (50)
Other	50 (50)
Received Medicare benefits
No	16 (16)
Yes	84 (84)
Type of transplant
Living donor	37 (37)
Deceased donor	63 (63)
Mean months post-transplant ± SD	39.7 ± 29.8

Abbreviation: SD, standard deviation.

Table 2 Cronbach’s alpha for the health-related quality of life instruments

HQoL instrument	Cronbach’s alpha
PCS-12	0.92
MCS-12	0.88
KTQ-physical	0.82
KTQ-fatigue	0.90
KTQ-uncertainty/fear	0.63
KTQ-appearance	0.62
KTQ-emotional	0.82

Abbreviations: HQoL, health-related quality of life; KTQ, Kidney Transplant Questionnaire; MCS-12, mental component summary of the SF-12 health survey; PCS-12, physical component summary of the SF-12 health survey.

Table 3 Health-related quality of life instrument correlation matrix

Instrument	PCS-12	MCS-12	KTQ-physical	KTQ-fatigue	KTQ-uncertainty/fear	KTQ-appearance	KTQ-emotional
PCS-12	–	0.112	0.43***	0.42***	0.20*	−0.01	0.10
MCS-12	0.112	–	0.26**	0.48***	0.33**	0.28**	0.47***
KTQ-physical	0.43***	0.26**	–	0.59***	0.47***	0.29**	0.52***
KTQ-fatigue	0.42***	0.48***	0.59***	–	0.54***	0.31**	0.61***
KTQ-uncertainty/fear	0.20*	0.33**	0.47***	0.54***	–	0.40***	0.71***
KTQ-appearance	−0.01	0.28**	0.29**	0.31**	0.40***	–	0.36***
KTQ-emotional	0.10	0.47***	0.52***	0.61***	0.71***	.36***	–

* Notes: P < 0.05;

** P < 0.01;

*** P < 0.001.

Abbreviations: KTQ, Kidney Transplant Questionnaire; MCS-12, mental component summary of the SF-12 health survey; PCS-12, physical component summary of the SF-12 health survey.