Table 2.

Time to revision represented with intervals

Time to Revisions		Before 2011	After 2011	Total	pvalue
N%	<12 moths	59	55	114	0.27
		42.4%	36.2%	39.2%
	12-24 moths	47	49	96	0.08
		33.8%	32.2%	33.0%
	24-60 moths	22	34	56	0.15
		15.8%	22.4%	19.2%
	>120 moths	11	14	25	0.69
		7.9%	9.2%	8.6%
Total		139	152	291