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Preoperative patient demographics.
| Age, mean (SD), y | 53 (7.6) |
| BMI, mean (SD), kg/m2 | 31.7 (6.3) |
| Charlson Comorbidity Index, mean (SD) | 2 (1.3) |
| Patients with stable psychiatric illness, % | 22 (59.5) |
| Former substance abusers (none active), % | 28 (75.7) |
| Using narcotic pain medicines preoperatively, % | 3 (8.1) |
| Preoperative living situation, % | |
| Shelter | 21 (56.8) |
| Friend | 5 (13.5) |
| Vehicle | 4 (10.8) |
| Hotel | 4 (10.8) |
| Camping | 3 (8.1) |
BMI, body mass index; SD, standard deviation.
