Skip to main content

Advertisement

Table 3 Summary of costs among cohorts identified using methods for handling outliers/influential observations

From: Impact of alternative approaches to assess outlying and influential observations on health care costs

  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)
  1. BP: box-plot.