Predictors of time to relapse in amphetamine-type substance users in the matrix treatment program in Iran: a Cox proportional hazard model application

Table 3 Test of proportional hazard assumption

Variable	rho	chi2	df	prob > chi2
The Matrix treatment program (in sessions)	0.05	0.61	1	0. 44
Casual sex	−0.07	0.33	1	0.57
Criminal offences	0.15	1.46	1	0.23
Duration of amphetamines dependence (in years)	0.01	0.00	1	0.96
Family support	0.01	0.00	1	0.95
Global test		1.96	5	0.86

ISSN: 1471-244X