Table 4.

Tests of Latent Mean Differences between Drug Problem History and Non-Drug Problem History groups

Latent Variables	Z-score mean differencesa
Pain - Baseline	−.7.50 b
Aberrant Analgesic Use baseline	−8.63b
Pain-specific Analgesic Use baseline	−4.93b
SES	5.32b
Pain – Time 2	−6.71b
Aberrant Analgesic Use -Time 2	−5.61b
Pain-specific Analgesic Use -Time 2	−4.83 b
Pain – Time 3	−6.94 b
Aberrant Analgesic Use - Time 3	−3.94 b
Pain-specific Analgesic Use – Time 3	−3.91 b

^aNegative Z-score indicates higher score for Drug Problem History group.

^bp ≤ .001.