Cannabis use among 1335 patients presenting for surgery and enrolled in the Analgesic Outcomes Study
| n | % | 95% CI | |
| Use cannabis | 79 | 5.9 | 4.8 to 7.3 |
| Reasons for cannabis use | |||
| Medical only | 42 | 53.2 | 42.0 to 64.0 |
| Recreational only | 15 | 19.0 | 11.7 to 29.3 |
| Medical and recreational | 20 | 25.3 | 16.8 to 36.2 |
| Other | 2 | 2.5 | 0.6 to 9.8 |
| Medical reasons | |||
| Chronic pain | 57 | 91.9 | 81.8 to 96.7 |
| Sleep | 26 | 41.9 | 30.2 to 54.7 |
| Anxiety | 21 | 33.9 | 23.0 to 46.7 |
| Nausea | 10 | 16.1 | 8.8 to 27.7 |
| Migraine | 6 | 9.7 | 4.3 to 20.2 |
| Glaucoma | 1 | 1.6 | 0.2 to 11.0 |
| Other | 6 | 9.7 | 4.3 to 20.2 |
| Have medical cannabis card | 36 | 45.6 | 34.8 to 56.8 |
| Times per month*† | 23.7 | 34.1 | 16.0 to 31.4 |
Percentage of patients who use cannabis is calculated from full sample of 1335 patients. Percentage of patients who have a cannabis card and reasons for cannabis use are calculated from the subsample of 79 patients who reported cannabis use. Percentages of medical reasons for cannabis use are calculated from the subsample of 62 patients who reported medical reasons for cannabis use.
*Mean (SD) presented for this item.
†One person reported using cannabis 240 times per month. Removing this person from the analysis reduces the mean number of times per month to 20.9 (23.3).