Steer R A, Kotzker E
Drug Alcohol Depend. 1978 Nov;3(6):399-403. doi: 10.1016/0376-8716(78)90012-1.
Product moment correlations were calculated between 17 psychosocial characteristics of 216 heroin addicts and their lengths of stay for first and second admissions to the dame methadone maintenance program. None of the variables which were related to retention during the first admission was associated with retention during the second admission. The conclusion was drawn that the relationships between addict characteristics and length of stay vary according to admission, and it would be unwise to use addicts' former treatment experiences to predict latter responses.