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GENERAL INFORMATION
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Funder: The Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Department of Health and Human Services, under contract Nos. HHSN272201000045C and HHSN272201700061C entitled “External Quality Assurance Program Oversight Laboratory (EQAPOL)” and grant no. IAA-Y1-HB-5026-01 entitled “Global HIV panel project”.

Associated Publication (Pending): Sheila Keating, Wes Rountree, Eduard Grebe, Andrea L. Pappas, Mars Stone, Dylan Hampton, Christopher A. Todd, Marek S. Poniewierski, Ana Sanchez, Cassandra G. Porth, Thomas N. Denny, Michael P. Busch (2019). Development of an international external quality assurance program for HIV-1 incidence using the Limiting Antigen Avidity assay. Submitted to PLOS ONE. 

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DATA OVERVIEW
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There are two .csv files one for the LAg calibrator data (LAg_Calibrator_Values.csv) and one for the LAg OD/ODn values (LAg_OD_ODn_Values.csv)

LAg_Calibrator_Values.csv contains the following variables:
EP 			numeric value for External Proficiency number
SITE_NUMBER		character value for the site
KIT_TYPE		character value for kit type (Sedia or Maxim)
INITIAL_CONFIRMATORY	character value for calibrator type (Initial or Confirmatory)		
CALIBRATOR		numeric value for the calibrator

LAg_OD_ODn_Values.csv contains the following variables:
EP 			numeric value for External Proficiency number
SITE_NUMBER		character value for the site
SAMPLE_GID		character value for the blinded sample in each EP
KIT_TYPE		character value for kit type (Sedia or Maxim)
CONFIRMATORY_REPLICATE	character value for the replicate number, NA if not a replicate		
SEROLOGY		character value for the serology (pos/neg) N/A if not performed
CLASSIFICATION		character value for the sample status (Recent, Long Term, Negative)
SAMPLE			numeric value for the sample number in the EP
DHVI_PubID		character value for the blinded ID
od_value		numeric optical density value
odn_value		numeric normalized optical density value

These two data files provided represent the data used for analyses performed in the paper mentioned above.  See the statistical analyses section for details. 
Data were uploaded to the EQAPOL website by labs participating in the EPs.
The paper mentioned above provides other relevant information regarding the EQAPOL Limiting Antigen (LAg) Incidence Assay.