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Table 2 Comparison of information on tumour size (pT) and lymph node involvement (pN) between the Belgian Cancer Registry (BCR) database and detailed pathological reports (PAT)

From: Combining data to perform population-based observational studies: know your sources. The case of thyroid cancer in Belgium

   BCR
   pT1 pT2 pT3 pT4 pT category reported pTx total
PAT pT1 989 23 2 0 1014 286 1300
  pT2 15 315 6 1 337 64 401
  pT3 8 3 280 2 293 39 332
  pT4 0 1 4 79 84 21 105
  pT category reported 1012 342 292 82 1728 410 2138
  pTx 31 13 14 4 62 200 262
  total 1043 355 306 86 1790 610 2400
   pN0 pN1 pN1a pN1b pN category reported pNx total
  pN0 254 3 2 0 259 45 304
  pN1 0 33 3 1 37 9 46
  pN1a 2 19 75 3 99 13 112
  pN1b 3 16 6 115 140 22 162
  pN category reported 259 71 86 119 535 89 624
  pNx 202 10 3 8 223 1553 1776
  total 461 81 89 127 758 1642 2400