Table 2.

Treatment outcomes, methadone doses, and methadone blood levels.

	(n = 76)
Treatment outcomes
Drop-outs during weeks 4–12, % (n)	9.2 (7)
Retention, days	81.6 ± 8.9
Longest continuous period of negative urine tests, weeks	8.0 ± 3.9
No. of negative urine samples	8.7 ± 3.5
Methadone doses and blood levels
Average dose weeks 4–12, mg	46.8 ± 24.3
Mean dose at blood sampling, mg	50.9 ± 25.3
Total trough, ng/mL	222.0 ± 132.3
Free trough, ng/mL	11.6 ± 7.3
Total peak, ng/mL	356.2 ± 203.7
Free peak, ng/mL	18.8 ± 11.4
Free peak to free trough ratio, %	1.716 ± 0.553
Total peak to total trough ratio, %	1.766 ± 0.636