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Effect of methadone dose on abstinence from (A) illicit opiates and (B) cocaine (B) in methadone-maintained outpatients. Data are collapse across contingency-management groups. NCLow: noncontingent vouchers, lower dose of methadone. CocLow: cocaine-contingent vouchers, lower dose of methadone. SplitLow: cocaine- and opiate-contingent vouchers, lower dose of methadone. NCHigh, CocHigh, SplitHigh: corresponding voucher conditions with higher dose of methadone.
