Table 2.

Demographic characteristics of the low versus high poly-substance use disorder groups among adult patients in opiate detoxification treatment (N=343)

Latent class membership	C1: Low severity	C2: High severity	χ2 (df) or t-test	Crude regression coefficient, β1
Sample size	N= 310	N=33		N=343
Age in years
Mean (SE)	37.99 (0.57)	32.97 (1.72)	t=2.77**	−0.01 NS
Education in years
Mean (SE)	12.61 (0.12)	12.73 (0.34)	t=0.32 NS	0.06 NS
Treatment setting, %
Inpatient	31.0	51.5	5.70 (1)*	0.13 NS
Outpatient	69.0	48.5		1.00
Gender, %
Male	68.1	66.7	0.03 (1)	0.01 NS
Female	31.9	33.3	NS	1.00
Race/ethnicity,%
White	41.3	81.8	19.78 (1)**	----
Non-white	58.7	18.2		----
Race/ethnicity,%
White	41.3	81.8	22.67 (3)**	1.00
African American	34.2	0		−0.25*
Hispanic	20.6	15.2		−0.45**
Other	3.9	3.0		−0.35 NS
Employment,%
Employed	51.3	45.5	0.41 (1)	−0.07 NS
Not employed	48.7	54.5	NS	1.00

¹The MIMIC modeling of the latent factor score of the six substance use disorders and its association with background demographic variables.

NS: P>0.05;

^*P<0.05;

^**P<0.01.