Table 3.

Summary of costs among cohorts identified using methods for handling outliers/influential observations

	BP outliers	Winsor02	Winsor05	DFBETA03	DFBETA15	BP/DFBETA15	Cook’s distance
	N mean (SD) (range)
Overall
	3,615	3,842	3,842	3,567	3,826	3,829	3,729
	37,409	36,745	35,714	33,619	37,379	37,440	34,493
	(25,755)	(27,814)	(23,763)	(22,633)	(33,671)	(33,754)	(24,792)
	(5,310–165,803)	(693–135,659)	(6,255–96,806)	(43–210,530)	(43–679,472)	(43–679,472)	(43–228,199)
Stage at diagnosis
I	893	1,028	1,028	914	1,020	1,022	989
	29,783	26,796	26,437	23,338	26,190	26,428	23,656
	(24,578)	(25,489)	(21,321)	(16,513)	(25,192)	(25,742)	(19,622)
	(5,506–165,803)	(693–135,659)	(6,255–96,806)	(77–116,396)	(77–242,913)	(77–242,913)	(77–160,942)
II	1,141	1,181	1,181	1,119	1,178	1,179	1,140
	36,547	37,074	35,725	33,710	38,406	38,416	34,312
	(25,869)	(27,988)	(23,505)	(22,774)	(38,106)	(38,092)	(24,154)
	(6,315–153,706)	(693–135,659)	(6,255–96,806)	(43–210,530)	(43–679,472)	(43–679,472)	(43–210,530)
III	866	890	890	850	888	888	868
	43,976	45,170	43,750	42,160	46,821	46,821	43,495
	(24,262)	(26,889)	(22,784)	(22,905)	(36,306)	(36,306)	(25,197)
	(7,313–164,668)	(693–135,659)	(6,255–96,806)	(120–184,422)	(120–405,892)	(120–405,892)	(120–228,199)
IV	715	743	743	684	740	740	732
	40,353	39,897	38,909	36,592	39,834	39,834	38,743
	(26,198)	(27,589)	(24,214)	(23,825)	(28,470)	(28,470)	(26,055)
	(5,310–150,985)	(693–135,659)	(6,255–96,806)	(71–150,485)	(71–237,281)	(71–237,281)	(71–150,985)
Colectomy
No	334	407	407	297	403	406	393
	28,911	24,285	24,531	21,071	23,380	24,058	21,947
	(23,990)	(24,383)	(21,417)	(15,166)	(22,543)	(24,147)	(20,392)
	(5,310–162,908)	(693–135,659)	(6,255–96,806)	(90–99,518)	(90–135,659)	(90–162,908)	(90–127,699)
Yes	3,281	3,435	3,435	3,270	3,423	3,423	3,336
	38,274	38,222	37,040	34,758	39,027	39,027	35,971
	(25,775)	(27,829)	(23,681)	(22,855)	(34,377)	(34,377)	(24,849)
	(5,506–165,803)	(693–135,659)	(6,255–96,806)	(43–210,530)	(43–679,472)	(43–679,472)	(43–228,199)

BP: box-plot.