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Table 6 Invalid Datesa

From: Complexities, variations, and errors of numbering within clinical notes: the potential impact on information extraction and cohort-identification

  31 32 33 34 35 36 37 38 39
January 55,596b 7 11 3 11 6 3 5 8
February 30 5 6 2 4 1 5 0 3
March 56,701b 23 7 12 113 1 12 9 5
April 285 6 8 4 4 0 4 2 8
May 50,884b 19 9 18 4 4 16 8 11
June 31 273 10 5 6 5 3 5 15
July 59,207b 9 7 11 7 8 4 1 3
August 57,896b 5 10 6 8 8 5 5 7
September 257 6 0 5 6 4 1 4 5
October 59,150b 13 10 4 2 3 5 5 3
November 234 6 2 3 10 7 1 5 3
December 25,840b 7 10 6 2 3 2 4 3
  1. aThe cell in the upper right corner would be ‘January 39’. Not included in this table is ‘February 30’ which appeared in 117 documents. Total number of invalid date instances in this table: 1917
  2. b The 31st day for January, March, May, July, August, October, and December are, of course, valid
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