Using association rules mining to explore pattern of Chinese medicinal formulae (prescription) in treating and preventing breast cancer recurrence and metastasis

Table 2 Association of the herbs from 96 formulae with Five Properties (N = 180 in 96 formulae)

Five properties	Number of herbs	Occurrence frequency (%)	Number of formulae	Frequency of use (%)
Warm	67	37.22	90	93.75
Cold	60	33.33	71	73.96
Neutral	40	22.22	82	85.42
Cool	8	4.44	44	45.83
Hot	5	2.78	8	8.33

Occurrence frequency = number of herbs belonging to each category / total number of recorded herbs (i.e. 180); Frequency of use = number of formulae recording the use of the herbs / total number of selected formulae (i.e.: 96).

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