Table 1.

Semantic type annotation of medication information in mayo and i2b2.

i2b2		Mayo
Semantic type	Definition	Semantic type	Definition
medication (m)	medication name	medication (m)	medication name
dosage (do)	the amount of a single medication used in each administration (e.g., “one tab” “4 units” “30 mg”)	dosage (do)	how many of each medication the patient is taking (e.g., “2” in “2 daily”, “1” in “1 tablet”)
		strength number (sn)	e.g., “30” in “30 mg”
		strength unit (su)	e.g., “mg” in “30 mg”
frequency (f)	how often each dose of the medication should be taken (e.g., “daily” “once a month” “3 times a day”)	freq number (fn)	e.g., “twice” in “twice a day”
		freq unit (fu)	e.g., “day” in “twice a day”
mode (mo)	the route for administering the medication (e.g., “oral” “intravenous” “topical”)	route (mo)	same as the i2b2
duration (du)	how long the medication is to be administered (e.g., “for a month” “during spring break”)	duration (du)	same as the i2b2 but not include preposition (e.g., “a month” in “for a month)
		form† (fm)	the physical appearance of the medication (e.g., aerosol, capsule, cream, tablet)

Notes: Parenthesized strings in the semantic type column are abbreviations.

^†In i2b2, there is no form annotation but it may be part of the medication or dosage (eg, m: “Aspirin tablet”, do: “1 tab”).