BMC Medical Informatics and Decision Making

Table 6 Invalid Dates^a

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	55,596^b	7	11	3	11	6	3	5	8
February	30	5	6	2	4	1	5	0	3
March	56,701^b	23	7	12	113	1	12	9	5
April	285	6	8	4	4	0	4	2	8
May	50,884^b	19	9	18	4	4	16	8	11
June	31	273	10	5	6	5	3	5	15
July	59,207^b	9	7	11	7	8	4	1	3
August	57,896^b	5	10	6	8	8	5	5	7
September	257	6	0	5	6	4	1	4	5
October	59,150^b	13	10	4	2	3	5	5	3
November	234	6	2	3	10	7	1	5	3
December	25,840^b	7	10	6	2	3	2	4	3

^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
^b The 31st day for January, March, May, July, August, October, and December are, of course, valid

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