Table 1.

Sensitivity and Specificity of Different Lot Quality Assurance Sampling Definitions for Classifying Outpatient Clinics, Using Data From Conventional Antimicrobial Resistance Surveillance, Medan and Bandung, Indonesia, 2014–2016

LQAS Definition, %	Required Sample Size, No.	Sensitivitya, %	Specificityb, %
2–10c	76	100.0	44.1
5–20	44	99.9	85.0
10–20	112	100.0	98.9
10–30	37	99.6	85.2
20–50	23	98.8	80.7
30–50	53	99.9	87.1

Abbreviations: AMR, antimicrobial resistance; LQAS, lot quality assurance sampling.

^a Percentage of draws accurately classified as “high resistance.”

^b Percentage of draws accurately classified as “low resistance.”

^c The upper value indicates the upper threshold of resistance prevalence above which an antibiotic should not be used for the empirical treatment of patients suspected of a urinary tract infection. The lower and upper thresholds together indicate the range of the true but unknown AMR prevalence in which misclassification is allowed to occur.