Similarly, the total number of repetitions was significantly lower in SEQC (71.1 [+ or -] 4.7 repetitions) compared with SEQD (83.7 [+ or -] 6.1 repetitions).
Additionally, the total number of repetitions for all the exercises and the total number of the repetitions in the sessions showed significantly reduced values in SEQA and SEQC (sessions with two-minute intervals between sets and exercises).
An independent samples t test was used to compare the differences of the two groups in their explicit cognition: times of compulsory drug rehabilitations (t = .69, df = 75, p = .490), self-assessment of desire for drug (t = 2.28, df = 80, p < .05), explicit attitude to heroin (t = -.68, df = 69, p = .498), SEQC (t = -.55, df = 72, p = .603).
To gain a much clearer understanding of the relationship between implicit and explicit cognition and the severity of engagement in further drug abuse, multiple regression analysis was performed using the number of compulsory drug rehabilitations as a dependent variable, and the IAT1 (pleasant-unpleasant IAT), IAT2 (me-not me IAT), self assessment of desire for heroin, and SEQC as the predictor variables.
In Spain, the questionnaires were sent in May 2002 to all participating laboratories in the external quality assessment program performed by the Spanish Society of Clinical Chemistry and Molecular Pathology (SEQC).
 Laboratori Clinic Bon Pastor Barcelona and the Analytical Quality Commission of the Spanish Society of Clinical Biochemistry and Molecular Pathology (SEQC), Barcelona, Spain.