Table 3.

Grading criteria and interpretation for the colistin diagnostic tests.

Grading parameters	Grades	Interpretation
Time in hours needed to perform each test	1	Less than 1 hour
	2	1–2 hours
	3	Above 2 hours
Ease in carrying out test	1	Easy
	2	A bit laborious
	3	Taxing or laborious
Skill or training required	1	No skill required
	2	Some/average skill required
	3	Advanced skill required
Requirement for 3rd-party equipment and infrastructure	1	Not required
	2	1–2 required
	3	More than 2 required
Cost and access to 3rd-party equipment and infrastructure	1	Not required
	2	Expensive (<$20,000) and access required
	3	Very expensive (>$20,000) and requires access/permission