Table 2

Codes applied to patterns of antibiotic administration documented in patient charts*

Category	Category description
On-time	A	Preoperative antibiotic orders documented and antibiotic documented given on time
On-time	B	No preoperative antibiotic orders documented but antibiotics documented given on time
Discordant	C	Preoperative antibiotic orders documented and documented as given untimely (early or late)
Discordant	D	No preoperative antibiotic orders documented and antibiotic documented as given untimely (early or late)
Contra-indicated	E	Antibiotic given but contraindicated
Not-documented	F	Preoperative antibiotic orders documented and antibiotic not documented as given
Not-documented	G	No preoperative antibiotic orders documented, no antibiotic given, but should have been ordered and given
Ambiguous-timing	H	Preoperative antibiotic orders documented, antibiotic documented as given, but timing ambiguous
Ambiguous-timing	I	No preoperative antibiotic orders documented, antibiotic documented as given, but timing ambiguous
Excluded from analysis	J	Procedure does not necessitate preoperative antibiotics
	K	Insufficient documentation present in patient chart
	L	Chart not reviewed

↵* For procedures with a single antibiotic involved, the case was coded as per the antibiotic code. For cases with multiple antibiotics involved and discordant antibiotic codes, see text for description of how case was coded.