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

Table 4 Birthday distributions

	Frequency count	Probability	Frequency count	Probability
Birthday on/in^a
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/in^b
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/in^c
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

ISSN: 1747-597X