. Author manuscript; available in PMC: 2013 Apr 10.

Published in final edited form as: Pract Radiat Oncol. 2011 Aug 3;2(2):77–85. doi: 10.1016/j.prro.2011.06.009

Table 6.

Period incidence analysis

Interval (mo)	Free of local progression	Local progression	P value
3–6	12/64 (18.8%)	8/14 (57.1%)	.0058
6–9	11/50 (22.0%)	9/12 (75.0%)	.0010
9–12	3/30 (10.0%)	3/6 (50.0%)	.0451
12–15	3/19 (15.8%)	4/7 (57.1%)	.0572
15–18	1/12 (8.3%)	1/4 (25.0%)	.4500
18–21	0/7 (0%)	2/2 (100.0%)	.0278
21–24	1/7 (14.3%)	0/0 (N/A)	N/A

N/A, not applicable.