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Table 3 Total number of patients and endoscopies identified by different data sources

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

Data Source All Patients Patients with Endoscopy Patients without Endoscopy Total Number of Endoscopies
n (%) n (%)1 n (%)1 n (%)2
  1672 (100)    
Gold Standard   1443 (86) 229 (14) 1937 (100)
Chart Review   1310 (78) 362 (22) 1506 (78)
Unique3   40 (3)   205 (11)
Physician Billing   1300 (78) 372 (22) 1566 (81)
Unique3   24 (2)   152 (8)
Unique admin data4   91 (7)   125 (6)
Hospital Inpatient   326 (19) 1346 (81) 354 (18)
Unique3   9 (<1)   33 (2)
Unique admin data4   56 (4)   39 (2)
Hospital Outpatient   1021 (61) 651 (39) 1126 (58)
Unique3   4 (<1)   30 (2)
Unique admin data4   32 (2)   63 (3)
Combined Administrative 1403 (84) 269 (16) 1732 (89)
Unique3   133 (9)   431 (22)
  1. 1 Percent based on all patients included in the study (n=1443).
  2. 2 Percent based on total number of endoscopies identified in gold standard (n=1937).
  3. 3 Number (percentage) identified in one and only one data source.
  4. 4 Number (percentage) identified in one and only one of the administrative data sources, may also be identified from the chart review.