Table 3.

Risk of Accepted Claims from the Norwegian System of Patient Injury Compensation During 2008-2018 by Annual Procedure Volume Divided by Quartiles into Quartiles.

Quartiles (Q)	Odds Ratio	95% CI
Q1 vs all other	1.9	1.3 to 2.8
Q1 vs Q2	1.5	1.0 to 2.2
Q1 vs Q3	2.0	1.1 to 3.7
Q1 vs Q4	2.5	1.6 to 3.7
Q2 vs Q3	1.3	.8 to 2.3
Q2 vs Q4	1.6	1.2 to 2.2
Q3 vs Q4	1.2	.7 to 2.1

Q1, Quartile 1 (<152 annual procedures); Q2, Quartile 2 (152-303 annual procedures); Q3, Quartile 3 (304-455 annual procedures); Q4, Quartile 4 (>456 annual procedures); CI, Confidence interval.