Validation of administrative data sources for endoscopy utilization in colorectal cancer diagnosis

Table 1 Patient characteristics of cohort and sample

Characteristics	Cohort (%)	Sample (%)
Total Number	8310 (100)	1672 (100)
Age at diagnosis
Mean [Median]	69 [70]	69 [70]
<=65	3042 (37)	643 (38)
66-74	2172 (26)	437 (26)
>=75	3096 (37)	592 (35)
Stage at diagnosis
I-III	5500 (66)	1145 (68)
IV or Unknown	2810 (34)	527(32)
Type of 1 ^st colorectal cancer-related visit ¹
Late² event	2545 (31)	506 (30)
(Pre)Diagnostic event	5765 (69)	1166 (70)
Time from diagnosis to death (days) ³
Mean [Median]	661 [453]	711 [466]
<= 1 month	491 (11)	84 (10)
1 - 3 months	472 (11)	90(10)
>= 3 months	3431(78)	710 (80)

¹ Limited to healthcare visits within 1 year prior to diagnosis of colorectal cancer.
² Late event is defined as a visit that included treatment-related events (e.g., surgery, palliative care) rather than diagnostic or pre-diagnostic events (e.g., radiology, symptoms). Patients who did not have any colorectal cancer-related healthcare visits are also included in this group.
³ Includes only patients who died on or before March 31, 2009.

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