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TABLE 4: Comparison of safety and efficacy results
Previous Device Procedure Success Complications
No. P Value^a No. P Value^a
0 (n = 337) 320 (95) NA 2 (0.6) NA
1 (n = 90) 88 (98) >.05 0 >.05
2 (n = 34) 31 (91) >.05 1 (2.9) >.05
3 (n = 9) 7 (78) .0256^b 0 >.05^c
4 (n = 4) 3 (75) >.05^b 0 >.05^c
5 (n = 1) 1 (100) >.05^b 0 >.05^c
Note.—Data in parentheses are percentages. NA = not applicable.
a Compared with results for 0 previous procedures.
b Groups with three to five procedures pooled, P = .0096.
c Groups with three to five procedures pooled, P > .05.

Previous Device Procedure	Success		Complications
Previous Device Procedure	No.	P Value^a	No.	P Value^a
0 (n = 337)	320 (95)	NA	2 (0.6)	NA
1 (n = 90)	88 (98)	>.05	0	>.05
2 (n = 34)	31 (91)	>.05	1 (2.9)	>.05
3 (n = 9)	7 (78)	.0256^b	0	>.05^c
4 (n = 4)	3 (75)	>.05^b	0	>.05^c
5 (n = 1)	1 (100)	>.05^b	0	>.05^c