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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) |
| 1–7 | 4.1 (18 163) | 2.2 (2340) |
| 8–30 | 4.5 (19 712) | 5.4 (5902) |
| 31–90 | 1.7 (7492) | 7.8 (8448) |
| >90 | 0 (0) | 31.8 (34 524) |
