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Table 1 Colorectal surgery patients identified by data source of cancer registry, physician billing and hospital inpatient data

From: Validation of colorectal cancer surgery data from administrative data sources

   Surgery Patients Identified from Each Data Source
Factors All Patients Cancer Registry Physician Billing Hospital Inpatient Combined Administrative
  n n (%) 1 n (%) 1 n (%) 1 n (%) 1
  8308 7066 (85) 7173 (86) 6905 (83) 7241 (87)
Year          
2000 1324 1149 (87) 1168 (88) 1131 (85) 1183 (89)
2001 1331 1126 (85) 1155 (87) 1109 (83) 1166 (88)
2002 1337 1152 (86) 1170 (88) 1135 (85) 1181 (88)
2003 1432 1231 (86) 1232 (86) 1200 (84) 1250 (87)
2004 1418 1176 (83) 1202 (85) 1152 (81) 1210 (85)
2005 1466 1232 (84) 1246 (85) 1194 (81) 1257 (86)
Stage          
I 1387 1379 (99) 1251 (90) 1204 (87) 1259 (91)
II 2207 2166 (98) 2167 (98) 2125 (96) 2174 (99)
III 1902 1875 (99) 1867 (98) 1835 (96) 1870 (98)
IV 1953 1164 (60) 1396 (71) 1293 (66) 1436 (74)
Missing 859 482 (56) 492 (57) 464 (54) 508 (59)
Tumor Site          
Colon 5303 4534 (85) 4585 (86) 4429 (84) 4608 (87)
Rectum 3005 2532 (84) 2588 (86) 2492 (83) 2639 (88)
  1. 1 Percent is based on “All Patients” in each row.