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Table 1 The number of injury accidents on Fridays the 13th, the previous (the 6th) and following (the 20th) Fridays. N for the matched triplets of Fridays = 21.

From: Females do not have more injury road accidents on Friday the 13th

Friday Total Daily Mean
6th 542.5* 25.83
13th 608 28.95
20th 546.5 26.02
  1. * Decimal numbers in Tables 1-3 are due to replacement of seven holidays or otherwise unusual control Fridays with the mean values of the variables from the previous and following years' closest Fridays.