Table 1.

Characteristics of the subjects of the different groups

Subjects (males/females)AgeWeight
Group 1 (natural history)48  (26/22)38.2  ± 8.563.4  ± 10.8
Group 2 (hidden naloxone)20  (10/10)36.1  ± 7.663.8  ± 7.8
Group 3 (placebo on left hand)25  (13/12)40.4  ± 9.859.7  ± 9.5
Group 4 (placebo on left hand plus naloxone)27  (13/14)36.7  ± 8.860.1  ± 11.4
Group 5 (placebo on right hand and left foot)24  (12/12)39.0  ± 7.665.2  ± 11.0
Group 6 (placebo on right hand and left foot plus naloxone)29  (16/13)37.5  ± 9.161.9  ± 8.4