Table 4

ORs and confidence intervals for outcomes, according to selected subgroups

Cannabis use statusRespiratory-related ER visit or hospital admissionAll-cause ER visit or hospital admission
N (%)OR (95% CI), p valueN (%)OR (95% CI), p value
By sex
 MenCannabis users81 (2.9%)1.00 (0.77 to 1.31), p=0.99742 (26,6%)1.23 (1.11 to 1.36), p<0.0001
Control group171 (2.9%)1.001327 (22.7%)1.00
 WomenCannabis users94 (4.7%)0.86 (0.68 to 1.10), p=0.23701 (34.8%)1.23 (1.10 to 1.37), p=0.0003
Control group239 (5.3%)1.001372 (30.1%)1.00
By prior respiratory-related ER visit/hospitalisation in the past year
 NoCannabis users149 (3.0%)0.94 (0.77 to 1.14), p=0.521333 (28.8%)1.22 (1.13 to 1.32), p<0.0001
Control group328 (3.5%)1.002490 (24.9%)1.00
 YesCannabis users33 (18.6%)0.82 (0.53 to 1.26), p=0.36110 (62.2%)1.25 (0.89 to 1.74), p=0.19
Control group82 (21.9%)1.00209 (55.9%)1.00
By tobacco smoking status
 Current/former smokerCannabis users123 (3.5%)0.80 (0.65 to 0.99), p=0.041070 (30.1%)1.16 (1.06 to 1.26), p=0.001
Control group290 (4.2%)1.001856 (27.1%)1.00
 Never smoker/not availableCannabis users52 (4.1%)1.23 (0.89 to 1.70), p=0.21373 (29.7%)1.35 (1.16 to 1.56), p<0.0001
Control group120 (3.4%)1.00843 (23.9%)1.00
By pre-existing asthma/COPD
 YesCannabis users62 (6.1%)0.82 (0.61 to 1.11), p=0.20362 (35.7%)1.16 (1.00 to 1.35), p=0.05
Control group157 (7.3%)1.00694 (32.1%)1.00
 NoCannabis users113 (3.0%)0.96 (0.77 to 1.20), p=0.701081 (28.5%)1.24 (1.13 to 1.35), p<0.0001
Control group253 (3.1%)1.002005 (24.4%)1.00
  • COPD, chronic obstructive pulmonary disease; ER, emergency room; n, number.