. Author manuscript; available in PMC: 2012 May 1.

Published in final edited form as: Public Health. 2011 Mar 16;125(5):269–274. doi: 10.1016/j.puhe.2011.01.009

Table 2.

Correlation coefficients and level of significance for background characteristics, family support, quality of life and concurrent substance use.

Variable	1	2	3	4	5	6	7	8	9	10	11	12	13	14
1. Female
2. Age	−0.149^***
3. Year of education	0.099^*	−0.047
4. Married/cohabiting	0.004	0.042	−0.008
5. Unemployed	0.056	0.028	−0.060	−0.290^***
6. Years of drug use	−0.139^**	0.453^***	−0.043	0.023	0.017
7. Injecting drug user	−0.046	−0.098^*	−0.040	−0.144^***	0.082	0.143^***
8. Duration of methadone maintenance therapy	−0.020	0.212^***	0.035	0.054	−0.026	0.255^***	0.151^***
9. Current daily dose	−0.030	−0.027	0.019	−0.039	0.085^*	0.052	0.137^**	0.045
10. Family support	0.140^***	−0.077	0.081	0.106^*	−0.208^***	−0.118^**	−0.070	0.018	−0.023
11. Physical health	0.027	−0.096^*	0.067	0.060	−0.132^**	−0.162^***	−0.139^***	−0.125^**	−0.111^**	0.380^***
12. Psychological health	−0.002	−0.072	−0.018	0.151^***	−0.202^***	−0.145^***	−0.103^*	−0.037	−0.042	0.459^***	0.639^***
13. Social health	0.105^*	−0.120^**	−0.035	0.101^*	−0.156^***	−0.100^*	−0.232^**	−0.058	−0.099^*	0.0406^***	0.508^***	0.483^***
14. Environmental health	0.007	−0.143^***	0.095^*	0.171^***	−0.275^***	−0.156^***	−0.132^**	−0.023	−0.023	0.500^***	0.532^***	0.598^***	0.497^***
15. Concurrent drug use	−0.015	−0.014	0.017	−0.052	−0.010	−0.073	0.032	−0.042	0.105^*	−0.112^**	−0.060	−0.145^***	−0.036	−0.119^**

P<0.05,

^**

P<0.01,

^***

P<0.001,

^****

P<0.0001.