Table 3.

Most discriminant characteristics of OAT patients

Step	Predictors	B	Odds ratio	95 % CI	p
1	Dependence length	0.17	1.19	1.08–1.30	0.000
2	Duration of observation	0.38	1.46	1.17–1.82	0.001
3	Clean cocaine urinalyses	29.64	7.47E+12	46,674.13–1.20E+21	0.002

Statistic: Chi square 99.33, df 3, p = 0.000 correct classified 90.8 %