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

Table 5 Patient characteristics of those who had an endoscopy prior to colorectal cancer diagnosis compared to those who did not in the Gold Standard dataset

Characteristics	Did not have endoscopy n (%)	Had endoscopy n (%)	Pvalue
Total Number	229 (100)	1443 (100)
Age at diagnosis			*0.24*
Mean [Median]	70 [72]	68 [69]
<=65	84 (37)	559 (39)
66-74	53 (23)	384 (26)
>=75	92 (40)	500 (35)
Stage at diagnosis			*<.0001*
I-III	110 (48)	1035 (72)
IV or Unknown	119 (52)	408 (28)
Type of 1 ^st colorectal cancer-related visit ¹			*<.0001*
Late² event	104 (45)	402 (28)
(Pre)Diagnostic event	125 (55)	1041 (72)
Time from diagnosis to death (days) ³			*<.0001*
Mean [Median]	467 [200]	771 [546]
<= 1 month	41 (24)	43 (6)
1 - 3 months	20 (11)	70 (10)
>= 3 months	111 (64)	599 (84)

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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