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Table 4: 
Adverse events (per procedure) in centers with low (group A) and high (group B) numbers of cases/hospital
Group A (n = 187) Group B (n = 513) P Value
No. % (95% CI) No. % (95% CI)
Specific complications 24 12.8 (8.6–18.2) 64 12.5 (9.8–15.5) .89
    TE 13 7.0 (3.9–11.3) 37 7.2 (5.2–9.7) .90
    Rupture^a 7 3.7 (1.6–7.3) 11 2.1 (1.1–3.7) .27
    Device^b 4 2.1 (0.7–5.1) 16 3.1 (1.9–4.9) .49
Nonspecific complications 6 3.2 (1.3–6.5) 10 1.9 (1.0–3.4) .39
Total 30 16.0 (11.3–1.8) 74 14.4 (11.6–17.7) .59
 
a Intraoperative rupture.
 
b Device-related complications.

	Group A (n = 187)		Group B (n = 513)		P Value
	No.	% (95% CI)	No.	% (95% CI)	P Value
Specific complications	24	12.8 (8.6–18.2)	64	12.5 (9.8–15.5)	.89
TE	13	7.0 (3.9–11.3)	37	7.2 (5.2–9.7)	.90
Rupture^a	7	3.7 (1.6–7.3)	11	2.1 (1.1–3.7)	.27
Device^b	4	2.1 (0.7–5.1)	16	3.1 (1.9–4.9)	.49
Nonspecific complications	6	3.2 (1.3–6.5)	10	1.9 (1.0–3.4)	.39
Total	30	16.0 (11.3–1.8)	74	14.4 (11.6–17.7)	.59