Table 1 Variables associated with patients with an adverse events (logistic regression model)
Explicative variablesOR (95% CI)
Service type* (medical)1.23 (0.89 to 1.72) NS
Hospital size (medium)†0.81 (0.66 to 0.99)
Hospital size (small)†1.44 (1.02 to 2.03)
Age‡1.98 (1.48 to 2.63)
Hospital stay length§5.07 (3.80 to 6.76)
Number of intrinsic risk factors¶1.57 (1.27 to 1.94)
Number of extrinsic risk factors**2.30 (1.68 to 3.17)
Age × no of extrinsic risk factors0.56 (0.37 to 0.82)
Service type × stay0.55 (0.38 to 0.83)

  • Reference categories: *surgical service; †comparing small and medium-sized hospitals with the big ones; ‡under 65; §less than 1 week; ¶intrinsic risk factors absence; **extrinsic risk factors absence.

  • NS, not significant.