Table 2

Comparison of adverse event rates according to severity category

Severity categoryNorway—mean (95% CI)Sweden—mean (95% CI)Sweden minus Norway difference (95% CI)
E-I12.96% (11.68% to 14.25%)14.41% (12.59% to 16.34%)1.44 (−0.82 to 3.78)
F-I7.59% (6.62% to 8.68%)7.70% (6.71% to 8.75%)0.11 (−1.38 to 1.56)
E6.42% (5.67% to 7.17%)8.10% (6.72% to 9.54%)1.68 (0.06 to 3.34)
F6.68% (5.70% to 7.78%)7.01% (6.10% to 7.97%)0.32 (−1.09 to 1.76)
G0.72% (0.53% to 0.92%)0.42% (0.31% to 0.56%)−0.29 (−0.53 to −0.06)
H0.20% (0.08% to 0.33%)0.13% (0.08% to 0.18%)−0.07 (−0.22 to 0.06)
I0.30% (0.21% to 0.40%)0.28% (0.20% to 0.38%)−0.02 (−0.15 to 0.11)
  • Rates (%) of hospital admissions with at least one adverse event in compounded severity categories E-I and F-I, and individual severity categories E, F, G, H and I, in Norway (N=45) and Sweden (N=63) in 2013.