Table 4

Prevalence of concurrency by category of opioid use and total days of concurrency. (P value<0.001)

Days of cumulative concurrency% intermittent users (n=439 105)% chronic users (n=108 604)
1–74.1 (18 163)2.2 (2340)
8–304.5 (19 712)5.4 (5902)
31–901.7 (7492)7.8 (8448)
>900 (0)31.8 (34 524)