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Table 4 Birthday distributions

From: New non-randomised model to assess the prevalence of discriminating behaviour: a pilot study on mephedrone

  Frequency count Probability Frequency count Probability
Birthday on/ina     
odd/even days 245,269 0.509872 235,771 0.490128
first half (up to and including the 15th)/second half of the month 239,157 0.497167 241,883 0.502833
first half/second half of the year 232,666 0.483673 248,374 0.516327
odd/even numbered months 242,683 0.504497 238,357 0.495503
Birthday on/inb     
odd/even days 253,438 0.511098 242,432 0.488902
first half (up to and including the 15th)/second half of the month 247,927 0.499984 247,943 0.500016
first half/second half of the year 247,447 0.499016 248,423 0.500984
Odd/even numbered months 251,226 0.506637 244,644 0.493363
Birthday on/inc     
odd/even days 5,739 0.514386 5,418 0.4856144
first half (up to and including the 15th)/second half of the month 5,562 0.498521 5,595 0.501479
first half/second half of the year 5,606 0.502465 5,551 0.497535
Odd/even numbered months 5,731 0.513669 5,426 0.486331
  1. aUS life insurance application data (n = 481,040)
  2. bUK university registration data (n = 495,870)
  3. cUK university registration data (n = 11,157)