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Table 1 Demographic and clinical data for general anesthetics at UWMC. Continuous variables are summarized by mean (sd). Categorical variables are summarised by n and %. Ordinal variables are summarized by median and interquartile range

From: Cannabis use is associated with a small increase in the risk of postoperative nausea and vomiting: a retrospective machine-learning causal analysis

VariableCannabis Use
NoneCurrentDaily
n (%)24,662 (90.0)1976 (7.2)750 (2.7)
Preoperative Data
Age in years [mean (sd)]53 (16)48 (15)50 (14)
ASA [n (%)]
 12577 (10.4)176 (8.9)19 (2.5)
 211,533 (46.8)925 (46.8)292 (38.9)
 310,532 (42.7)875 (44.3)439 (58.5)
Outpatient [n (%)]16,321 (65.6)1212 (61.3)438 (58.4)
Male Sex [n (%)]10,833 (44.3)1055 (53.4)390 (52.0)
Non-smoker [n (%)]22,571 (92.3)1526 (77.2)525 (70.0)
Prior PONV/Motion Sickness [n (%)]4604 (18.3)368 (18.6)191 (25.5)
Intraoperative Data
 Procedure Duration (min) [mean (sd)]120 (94)126 (105)133 (110)
 Exposed to Nitrous Oxide [n (%)]3152 (12.8)240 (12.1)111 (14.8)
 Surgery Higher Risk for Nausea [n (%)]4425 (17.5)341 (17.3)146 (19.5)
 Total Number of Prophylactic Agents (median, [IQR])2 [2,3]2 [2,3]2 [1,2]
Postoperative Data
 PACU Opioids [n (%)]12,969 (52.6)1184 (59.9)476 (63.5)
 Apfel Score (median, [IQR])2 [2,3]2 [1,3]2 [1,3]
Outcome
 PONV Observed [n (%)]4255 (17.3)372 (18.8)164 (21.9)