Table 2.

Example extraction rules

Rule	Examples
Mode (mode)?	iv, po
(0–9)(−0–9)* dose	20 mg, 2–3 tabs
q.(0–9) freq	q.6 h
Freq (per | a) freq	twice a week, once per day
(for | ×) (0–9) dur	for 3 weeks, ×5 days

^*Zero or more items.

dur, duration; freq, frequency; iv, intravenous; po, orally; tabs, tablets.