Epidemiologic Perspectives & Innovations

Table 3 Estimated survival at 15 years from diagnosis calculated using follow-up from NWTS* records only†, NWTS records supplemented with NDI* search results and NDI search results only

From: Mortality ascertainment of participants in the National Wilms Tumor Study using the National Death Index: comparison of active and passive follow-up results

		NWTS only			NWTS + NDI			NDI only
	Total	Died	% Alive	95% CI*	Died	% Alive	95% CI	Died	% Alive	95% CI
NWTS-1,2	1,310	317	77.8	(75.4, 79.9)	322	78.1	(75.8, 80.2)	307	79.0	(76.7, 81.1)
NWTS-3,4	4,907	670	85.7	(84.6, 86.7)	683	86.0	(85.0, 87.0)	618	87.4	(86.4, 88.3)

* NWTS, National Wilms Tumor Study; NDI, National Death Index; CI, confidence interval.
† April 2005 ascertainment of January 1, 2002 vital status.

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