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. Author manuscript; available in PMC: 2016 Apr 25.
Published in final edited form as: Biodemography Soc Biol. 2014;60(2):117–136. doi: 10.1080/19485565.2014.946590

Table 5. Co-Use Persistence Between Waves 3 & 4.

Any Use Baseline + School & Demographic Controls +Psychological Controls
Excess Proportion 0.977 1.010 1.008
Proportion Co-Users 0.990 0.992 0.991
Heavy Use Baseline + School & Demographic Controls +Psychological Controls
Excess Proportion 0.865* 0.833+ 0.832+
Proportion Co-Users 0.913* 0.796* 0.795*

Note: N=2,599 for the any use models (2,595 for the psychological control model); N= 1,345 for the heavy use models (1,342 for the psychological control model).