Table 2.

Multiple regression analysis of quality of life for all participants.

Variables	B	SE	Beta	P value	Variance inflation factor
(Constants)	3.453	0.110	N/Aa	<.001	N/A
Female (reference male)	0.105	0.070	.055	.13	1.140
Age ≥50 years (reference <50 years)	0.526	0.061	.320	<.001	1.184
Household income ≥4 and <8 million JPY (reference <4 million JPY)	–0.040	0.074	–.024	.59	1.637
Household income ≥8 million JPY (reference <4 million JPY)	–0.026	0.079	–.015	.79	1.704
Household income unknown or not available (reference <4 million JPY)	–0.187	0.098	–.076	.06	1.373
University/graduate degree (reference less than university degree)	0.035	0.060	.022	.55	1.158
Other/unknown (reference less than university degree)	0.112	0.208	.019	.59	1.101
Time since diagnosis ≥6 months and <1 year (reference <6 months)	–0.111	0.104	–.047	.29	1.657
Time since diagnosis ≥1 and <2 years (reference <6 months)	0.086	0.087	.049	.32	2.100
Time since diagnosis ≥2 years (reference <6 months)	–0.006	0.083	–.003	.95	2.244
Stomach cancer (reference lung cancer)	0.016	0.081	.010	.84	1.940
Colon cancer (reference lung cancer)	0.199	0.078	.124	.01	2.019
Stage II (reference Stage I)	–0.301	0.075	–.154	<.001	1.266
Stage III (reference Stage I)	–0.237	0.082	–.110	.004	1.242
Stage IV (reference Stage I)	–0.622	0.109	–.211	<.001	1.167
Stage unknown (reference Stage I)	–0.020	0.090	–.008	.82	1.254
Health literacy	0.106	0.029	.132	<.001	1.106
Social support	0.169	0.029	.210	<.001	1.096
Health literacy * Social support	–0.050	0.025	–.073	.047	1.139
Health literacy * Age	0.069	0.057	.043	.23	1.084
Social support * Age	0.196	0.057	.119	.001	1.039
Health literacy * Social support * Age	–0.082	0.048	–.061	.09	1.126

^aN/A: not applicable.