Table 3.

Multiple regression analysis of quality of life in patients aged 50 years or older.

Variables	B	SE	Beta	P value	Variance inflation factor
(Constant)	3.647	0.150	N/Aa	<.001	N/A
Female (reference male)	0.094	0.103	.044	.36	1.115
Household income ≥4 and <8 million JPY (reference <4 million JPY)	–0.110	0.094	–.066	.24	1.541
Household income ≥8 million JPY (reference <4 million JPY)	–0.059	0.099	–.034	.56	1.617
Household income unknown or not available (reference <4 million JPY)	–0.388	0.135	–.146	.004	1.255
University/graduate degree (reference less than university degree)	0.059	0.078	.037	.45	1.204
Other or unknown education (reference less than university degree)	0.068	0.245	.013	.78	1.120
Time since diagnosis ≥6 months and <1 year (reference <6 months)	–0.071	0.148	–.028	.63	1.737
Time since diagnosis ≥1 and <2 years (reference <6 months)	0.093	0.118	.055	.43	2.354
Time since diagnosis ≥2 years (reference <6 months)	0.067	0.113	.043	.55	2.522
Stomach cancer (reference lung cancer)	0.089	0.113	.053	.43	2.256
Colon cancer (reference lung cancer)	0.276	0.108	.176	.01	2.324
Stage II (reference Stage I)	–0.431	0.105	–.208	<.001	1.254
Stage III (reference Stage I)	–0.251	0.107	–.121	.02	1.279
Stage IV (reference Stage I)	–0.697	0.138	–.249	<.001	1.180
Stage unknown (reference Stage I)	–0.121	0.107	–.058	.26	1.294
Health literacy	0.125	0.039	.150	.002	1.087
Social support	0.246	0.038	.306	<.001	1.093
Health literacy * Social support	–0.083	0.036	–.109	.02	1.085

^aN/A: not applicable.