. 2007 Jun 26;7:29. doi: 10.1186/1471-244X-7-29

Table 1.

Mean score and standard deviation for HSCL-25 at baseline and follow-up, according to sociodemographic variables at baseline and substance-use variables at both at baseline and follow-up. Paired t-test and independent t-test.

	T1		T2
	Mean	SD	Mean	SD	P^a	P^b
Total sample (n = 137)	2.08	0.61	2.01	0.63	0.219
Age
< 30 years (n = 28)	2.12	0.63	2.00	0.61	0.371	0.933
≥ 30 years (n = 109)	2.07	0.61	2.01	0.64	0.366
Sex
Male (n = 97)	2.03	0.62	2.03	0.65	0.996	0.513
Female (n = 40)	2.19	0.58	1.96	0.58	0.019
Education
Only primary school (n = 59)	2.20	0.62	2.11	0.61	0.317	0.150
More than primary school (n = 66)	2.00	0.60	1.95	0.65	0.543
Civil status
Not married/cohabiting (n = 77)	2.13	0.66	2.03	0.63	0.200	0.650
Married/cohabiting (n = 50)	2.02	0.56	1.98	0.65	0.589
Employment %
Yes (n = 44)	2.04	0.61	2.03	0.66	0.940	0.911
No (n = 83)	2.13	0.62	2.02	0.62	0.098
Main substance of abuse
Alcohol (n = 77)	2.04	0.63	2.04	0.63	0.930	0.578
Poly-substance abuse (n = 60)	2.13	0.59	1.98	0.63	0.106
Age at onset of substance use disorder
≥ 18 years (n = 76)	2.07	0.63	1.90	0.64	0.022	0.020
< 18 years (n = 61)	2.09	0.58	2.15	0.59	0.489
Use of substances at T2
"Abstainers" (n = 41)	1.94	0.60	1.61	0.59	0.002	< 0.001
"Relapsers" (n = 96)	2.14	0.61	2.18	0.56	0.514

^aP value on paired t-test.

^bP value on independent t-test T2