Table 4.

Risk of accepted compensation claims from the Norwegian System of Patient Injury Compensation during 2008–2018 by annual procedure volume divided into quarters

Quarter (Q)	Odds ratio (95% CI)
Q1 vs, all others	3.0 (2.0–4.5)
Q1 vs. Q2	2.7 (1.7–4.4)
Q1 vs. Q3	2.6 (1.7–4.1)
Q1 vs. Q4	3.4 (2.2–5.2)
Q2 vs. Q3	1.0 (0.7–1.4)
Q2 vs. Q4	1.3 (0.9–1.8)
Q3 vs. Q4	1.3 (1.0–1.7)

Q1, ≤ 57 annual procedures;

Q2, 58–168 annual procedures;

Q3, 169–304 annual procedures; Q4, ≥ 305 annual procedures.

CI, confidence interval.