Table 4.

Effect of need–service matching and treatment duration on overall and primary drug use improvement.^a

	Parameter estimate (standard error)
	Overall drug use improvement			Primary drug use improvement
	Full model	Without treatment duration	Without needs service-matched	Full model	Without treatment duration	Without needs service-matched
Percent of needs service-matched	0.049 (0.021)^b	0.086 (0.021)^d	–	0.028 (0.016) [P = 0.09]	0.050 (0.016)^c	–
Treatment duration, per week	0.024 (0.003)^d	–	0.025 (0.003)^d	0.014 (0.002)^d	–	0.015 (0.002)^d
Past-year peak level of drug use	0.452 (0.008)^d	0.448 (0.008)^d	0.451 (0.008)^d	0.204 (0.006)^d	0.202 (0.006)^d	0.203 (0.006)^d
Reduction from past-year peak use	0.247 (0.073)^d	0.276 (0.074)^d	0.267 (0.070)^d	0.373 (0.056)^d	0.393 (0.056)^d	0.374 (0.054)^d
Female gender	0.092 (0.077)	0.094 (0.078)	0.092 (0.075)	0.093 (0.059)	0.092 (0.060)	0.102 (0.058)
Program treatment modality
Methadone	−1.363 (0.205)^d	−1.173 (0.225)^d	−1.375 (0.202)^d	−0.167 (0.152)	−0.054 (0.163)	−0.175 (0.149)
Non-methadone out-patient	Referent	Referent	Referent	Referent	Referent	Referent
Short-term residential	0.402 (0.214)	0.011 (0.234)	0.427 (0.210)^b	0.344 (0.156)^b	0.111 (0.168)	0.363 (0.154)^b
Long-term residential	0.166 (0.148)	0.099 (0.163)	0.192 (0.145)	0.320 (0.110)^c	0.280 (0.118)^b	0.343 (0.107)^c

Among 3103 patients with any service need. From multivariate mixed model regressions clustering patients within programs.

P < 0.05;

P < 0.01;

P < 0.001.