National Health and Nutrition Examination Survey

1999-2000 Data Documentation, Codebook, and Frequencies

Norovirus antibody - Serum (SSNORO_A)

Data File: SSNORO_A.xpt

First Published: July 2017

Last Revised: April 2022

Note: The NHANES Biospecimen Program processes were reevaluated in 2021 and 2022 to monitor quality control after a procedural error was identified. This error did not pose any risk of participant disclosure. Addressing this error resulted in the removal of some records from various stored biospecimen data files between 1999 and 2018 that did not meet program standards. After a comprehensive review of all stored specimen datasets, this data file was modified to remove records (10-<15% of records) that were initially included in error. No data values were altered. The sample weights and overall estimates were compared between the original and revised files. The sample weights provided with the original data release are appropriate to use with this updated data file; therefore, no new survey weights were created. The overall estimates from these files were examined and are consistent with the previous file. However, not all possible analyses were performed. For any queries related to this dataset please email the Biospecimen Program at serumplasmaurine@cdc.gov.

Component Description

Sera from residual specimens from NHANES 1999-2000 participants were tested for IgG antibodies against seven norovirus strains: GI.1 Norwalk, GI.4, GII.3, GII.4 US95/96, GII.4 Farmington Hills, GII.4 New Orleans, and GIV.1. A quantitative enzyme immunoassay that uses norovirus virus-like particles (VLPs) to detect anti-norovirus IgG was used. Samples were diluted 1:50 for analysis. The results are reported in optical density (OD) and ng IgG/ml. Samples with OD >3 (i.e. above the measurable range of the assay, strongly positive) are reported as 3.50. Samples with OD less than the plate blank are coded 0.00. Concentrations greater than the highest standard (2000 ng IgG/ml) are reported as 100,000 ng IgG/ml, the upper limit of detection. Missing observations represent samples that could not be tested due to insufficient volume or technical errors.

Eligible Sample

These tests were conducted on residual serum specimens stored at NCHS. Specimens were collected during the 1999-2000 study cycle. A one-third subsample of all subjects aged 16-49, maintaining population representativeness, was tested for anti-norovirus IgG antibody.

Description of Laboratory Methodology

Anti-norovirus IgG was measured using a previously published enzyme immunoassay (EIA) and virus-like particles (VLPs) as antigen. VLPs were provided by Dr. Robert Atmar at Baylor University. The EIA test utilizes VLP-coated wells. The serum samples were diluted 1:50 and incubated in the antigen-coated wells. If present, anti-norovirus antibodies are immobilized in the wells. Residual sample is eliminated by washing and conjugate (enzyme labeled antibodies to human IgG) is added and incubated. If IgG antibodies to norovirus are present, the conjugate will be immobilized in the wells. Residual conjugate is eliminated by washing and the enzyme substrate (p-nitrophenyl phosphate) is added. In the presence of the enzyme, the substrate is converted to a yellow end product which is read photometrically. Each sample was tested in duplicate.

Each plate had an IgG standard curve with known concentrations of human IgG ranging from 2000 ng/ml to 31.25 ng/ml. The standards were run in duplicate on each plate and the average of the duplicates was used to generate the standard curve. The curve was fit using a 4-point parametric fit in the Gen5 software and this curve was used to calculate concentrations for the samples on the same plate. Concentrations in ng IgG/ml were calculated for each well and averaged across the duplicates. Extrapolation beyond the standard curve was not allowed.

Optical density was determined on a BioTek ELx800 microplate reader and computer equipped with Gen5 software (BioTek, Winooski, VT).

Laboratory Quality Assurance and Monitoring

Quality control samples specific to each VLP antigen were included on every plate. Human serum from subjects with norovirus infections strain-matched to the assay VLPs was used as a positive control for all VLPs except GIV.1. For GIV.1, serum with high reactivity to GIV.1 (kind gift from B. di Martino) was used as a positive control because serum from subjects with known GIV.1 infections was not available. Negative control serum was selected from a panel of sera from uninfected subjects in norovirus human challenge studies. The serum sample with the lowest reactivity across all seven VLPs was used as the assay negative control.

Data Processing and Editing

Data was compiled after all the antibody testing was completed. Values above the upper limit of detection (OD = 3.0 or concentration = 100,000 ng IgG/ml) were replaced with 3.5 or 100,000, respectively. Values that were less than the plate blank were replaced with 0. Mean OD and concentration values were calculated using the replacement values.Data Access: All data are publicly available.

Analytic Notes

Due to cross-reactivity between strains and declining antibody levels after infection, there is no standard cutpoint value to determine seropositivity to norovirus in a single serum sample. Based on results of previous human challenge studies, a cutpoint of OD=1.5 is suggested to distinguish seropositive from seronegative samples. Additionally, an OD ≥3 (represented by a value of 3.50) is suggested to identify samples with recent (within the last year) infections.

Parallel analysis using the same selection and assay criteria was performed on serum samples from the 2003-2004 study cycle.


Variable	Definition
SEQN	Respondent Sequence Number
SSGI1C1	antibody concentration in duplicate 1 for GI.1 antigen
SSGI1C2	antibody concentration in duplicate 2 for GI.1 antigen
SSGI1CM	mean antibody concentration for GI.1 antigen
SSGI1OD1	optical density in duplicate 1 for GI.1 antigen
SSGI1OD2	optical density in duplicate 2 for GI.1 antigen
SSGI1ODM	mean optical density for GI.1 antigen
SSGI4C1	antibody concentration in duplicate 1 for GI.4 antigen
SSGI4C2	antibody concentration in duplicate 2 for GI.4 antigen
SSGI4CM	mean antibody concentration for GI.4 antigen
SSGI4OD1	optical density in duplicate 1 for GI.4 antigen
SSGI4OD2	optical density in duplicate 2 for GI.4 antigen
SSGI4ODM	mean optical density for GI.4 antigen
SSGII3C1	antibody concentration in duplicate 1 for GII.3 antigen
SSGII3C2	antibody concentration in duplicate 2 for GII.3 antigen
SSGII3CM	mean antibody concentration for GII.3 antigen
SSGII3O1	optical density in duplicate 1 for GII.3 antigen
SSGII3O2	optical density in duplicate 2 for GII.3 antigen
SSGII3OM	mean optical density for GII.3 antigen
SSGII4FC1	antibody concentration in duplicate 1 for GII.4 Farmington Hills antigen
SSGII4FC2	antibody concentration in duplicate 2 for GII.4 Farmington Hills antigen
SSGII4FCM	mean antibody concentration for GII.4 Farmington Hills antigen
SSII4FO1	optical density in duplicate 1 for GII.4 Farmington Hills antigen
SSII4FO2	optical density in duplicate 2 for GII.4 Farmington Hills antigen
SSII4FOM	mean optical density for GII.4 Farmington Hills antigen
SSII4UC1	antibody concentration in duplicate 1 for GII.4 US95/96 antigen
SSII4UC2	antibody concentration in duplicate 2 for GII.4 US95/96 antigen
SSII4UCM	mean antibody concentration for GII.4 US95/96 antigen
SSII4UO1	optical density in duplicate 1 for GII.4 US95/96 antigen
SSII4UO2	optical density in duplicate 2 for GII.4 US95/96 antigen
SSII4UOM	mean optical density for GII.4 US95/96 antigen
SSII4NC1	antibody concentration in duplicate 1 for GII.4 New Orleans antigen
SSII4NC2	antibody concentration in duplicate 2 for GII.4 New Orleans antigen
SSII4NCM	mean antibody concentration for GII.4 New Orleans antigen
SSII4NO1	optical density in duplicate 1 for GII.4 New Orleans antigen
SSII4NO2	optical density in duplicate 2 for GII.4 New Orleans antigen
SSII4NOM	mean optical density for GII.4 New Orleans antigen
SSGIV1C1	antibody concentration in duplicate 1 for GIV.1 antigen
SSGIV1C2	antibody concentration in duplicate 2 for GIV.1 antigen
SSGIV1CM	mean antibody concentration for GIV.1 antigen
SSGIV1O1	optical density in duplicate 1 for GIV.1 antigen
SSGIV1O2	optical density in duplicate 2 for GIV.1 antigen
SSGIV1OM	mean optical density for GIV.1 antigen

References

Di Martino, B., F. Di Profio, C. Ceci, E. Di Felice, K. Green, K. Bok, S. De Grazia, G. Giammanco, I. Massirio, E. Lorusso, C. Buonavoglia, F. Marsilio, and V. Martella. Seroprevalence of Norovirus genogroup IV antibodies among humans, Italy, 2010-2011. Emerg Infect Dis. 2014 Nov; 20(11): 1828-1832.
Lindesmith, L., E. Donaldson, J. Leon, C. Moe, J. Frelinger, R. Johnston, D. Weber, and R. Baric. Heterotypic humoral and cellular immune responses following Norwalk Virus infection. J. Virol. 2010 Feb; 84(4): 1800-1815.

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:: SEQN
SAS Label:: Respondent sequence number
English Text:: Respondent sequence number.
Target:: Both males and females 16 YEARS - 49 YEARS

SSGI1C1 - Antibody con. in dup. 1 for GI.1 ag

Variable Name:: SSGI1C1
SAS Label:: Antibody con. in dup. 1 for GI.1 ag
English Text:: Antibody con. in dup. 1 for GI.1 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	917	917
.	Missing	29	946

SSGI1C2 - Antibody con. in dup. 2 for GI.1 ag

Variable Name:: SSGI1C2
SAS Label:: Antibody con. in dup. 2 for GI.1 ag
English Text:: Antibody con. in dup. 2 for GI.1 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	916	916
.	Missing	30	946

SSGI1CM - Mean antibody concentration for GI.1 ag

Variable Name:: SSGI1CM
SAS Label:: Mean antibody concentration for GI.1 ag
English Text:: Mean antibody concentration for GI.1 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	917	917
.	Missing	29	946

SSGI1OD1 - Optical density in dup. 1 for GI.1 ag

Variable Name:: SSGI1OD1
SAS Label:: Optical density in dup. 1 for GI.1 ag
English Text:: Optical density in dup. 1 for GI.1 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	946	946
.	Missing	0	946

SSGI1OD2 - Optical density in dup. 2 for GI.1 ag

Variable Name:: SSGI1OD2
SAS Label:: Optical density in dup. 2 for GI.1 ag
English Text:: Optical density in dup. 2 for GI.1 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	945	945
.	Missing	1	946

SSGI1ODM - Mean optical density for GI.1 antigen

Variable Name:: SSGI1ODM
SAS Label:: Mean optical density for GI.1 antigen
English Text:: Mean optical density for GI.1 antigen
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	946	946
.	Missing	0	946

SSGI4C1 - Antibody con. in dup. 1 for GI.4 ag

Variable Name:: SSGI4C1
SAS Label:: Antibody con. in dup. 1 for GI.4 ag
English Text:: Antibody con. in dup. 1 for GI.4 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	896	896
.	Missing	50	946

SSGI4C2 - Antibody con. in dup. 2 for GI.4 ag

Variable Name:: SSGI4C2
SAS Label:: Antibody con. in dup. 2 for GI.4 ag
English Text:: Antibody con. in dup. 2 for GI.4 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	896	896
.	Missing	50	946

SSGI4CM - Mean antibody concentration for GI.4 ag

Variable Name:: SSGI4CM
SAS Label:: Mean antibody concentration for GI.4 ag
English Text:: Mean antibody concentration for GI.4 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	902	902
.	Missing	44	946

SSGI4OD1 - Optical density in dup. 1 for GI.4 ag

Variable Name:: SSGI4OD1
SAS Label:: Optical density in dup. 1 for GI.4 ag
English Text:: Optical density in dup. 1 for GI.4 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	946	946
.	Missing	0	946

SSGI4OD2 - Optical density in dup. 2 for GI.4 ag

Variable Name:: SSGI4OD2
SAS Label:: Optical density in dup. 2 for GI.4 ag
English Text:: Optical density in dup. 2 for GI.4 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	946	946
.	Missing	0	946

SSGI4ODM - Mean optical density for GI.4 ag

Variable Name:: SSGI4ODM
SAS Label:: Mean optical density for GI.4 ag
English Text:: Mean optical density for GI.4 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	946	946
.	Missing	0	946

SSGII3C1 - Antibody con. in dup. 1 for GII.3 ag

Variable Name:: SSGII3C1
SAS Label:: Antibody con. in dup. 1 for GII.3 ag
English Text:: Antibody con. in dup. 1 for GII.3 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	885	885
.	Missing	61	946

SSGII3C2 - Antibody con. in dup. 2 for GII.3 ag

Variable Name:: SSGII3C2
SAS Label:: Antibody con. in dup. 2 for GII.3 ag
English Text:: Antibody con. in dup. 2 for GII.3 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	883	883
.	Missing	63	946

SSGII3CM - Mean antibody con. for GII.3 ag

Variable Name:: SSGII3CM
SAS Label:: Mean antibody con. for GII.3 ag
English Text:: Mean antibody con. for GII.3 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	897	897
.	Missing	49	946

SSGII3O1 - Optical density in dup. 1 for GII.3 ag

Variable Name:: SSGII3O1
SAS Label:: Optical density in dup. 1 for GII.3 ag
English Text:: Optical density in dup. 1 for GII.3 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	938	938
.	Missing	8	946

SSGII3O2 - Optical density in dup. 2 for GII.3 ag

Variable Name:: SSGII3O2
SAS Label:: Optical density in dup. 2 for GII.3 ag
English Text:: Optical density in dup. 2 for GII.3 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	939	939
.	Missing	7	946

SSGII3OM - Mean optical density for GII.3 ag

Variable Name:: SSGII3OM
SAS Label:: Mean optical density for GII.3 ag
English Text:: Mean optical density for GII.3 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	946	946
.	Missing	0	946

SSII4FC1 - Ab dup 1 for GII.4 Farmington Hills ag

Variable Name:: SSII4FC1
SAS Label:: Ab dup 1 for GII.4 Farmington Hills ag
English Text:: Ab dup 1 for GII.4 Farmington Hills ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	892	892
.	Missing	54	946

SSII4FC2 - Ab dup 2 for GII.4 Farmington Hills ag

Variable Name:: SSII4FC2
SAS Label:: Ab dup 2 for GII.4 Farmington Hills ag
English Text:: Ab dup 2 for GII.4 Farmington Hills ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	892	892
.	Missing	54	946

SSII4FCM - Mean Ab for GII.4 Farmington Hills ag

Variable Name:: SSII4FCM
SAS Label:: Mean Ab for GII.4 Farmington Hills ag
English Text:: Mean Ab for GII.4 Farmington Hills ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	892	892
.	Missing	54	946

SSII4FO1 - OD_dup 1 for GII.4 Farmington Hills ag

Variable Name:: SSII4FO1
SAS Label:: OD_dup 1 for GII.4 Farmington Hills ag
English Text:: OD_dup 1 for GII.4 Farmington Hills ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	892	892
.	Missing	54	946

SSII4FO2 - OD_dup 2 for GII.4 Farmington Hills ag

Variable Name:: SSII4FO2
SAS Label:: OD_dup 2 for GII.4 Farmington Hills ag
English Text:: OD_dup 2 for GII.4 Farmington Hills ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	892	892
.	Missing	54	946

SSII4FOM - Mean OD for GII.4 Farmington Hills ag

Variable Name:: SSII4FOM
SAS Label:: Mean OD for GII.4 Farmington Hills ag
English Text:: Mean OD for GII.4 Farmington Hills ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	892	892
.	Missing	54	946

SSII4UC1 - Ab con in dup 1 for GII.4 US95/96 ag

Variable Name:: SSII4UC1
SAS Label:: Ab con in dup 1 for GII.4 US95/96 ag
English Text:: Ab con in dup 1 for GII.4 US95/96 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	882	882
.	Missing	64	946

SSII4UC2 - Ab con in dup 2 for GII.4 US95/96 ag

Variable Name:: SSII4UC2
SAS Label:: Ab con in dup 2 for GII.4 US95/96 ag
English Text:: Ab con in dup 2 for GII.4 US95/96 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	885	885
.	Missing	61	946

SSII4UCM - Mean Ab conc. for GII.4 US95/96 antigen

Variable Name:: SSII4UCM
SAS Label:: Mean Ab conc. for GII.4 US95/96 antigen
English Text:: Mean Ab conc. for GII.4 US95/96 antigen
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	891	891
.	Missing	55	946

SSII4UO1 - OD in dup 1 for GII.4 US95/96 antigen

Variable Name:: SSII4UO1
SAS Label:: OD in dup 1 for GII.4 US95/96 antigen
English Text:: OD in dup 1 for GII.4 US95/96 antigen
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	939	939
.	Missing	7	946

SSII4UO2 - OD in dup 2 for GII.4 US95/96 antigen

Variable Name:: SSII4UO2
SAS Label:: OD in dup 2 for GII.4 US95/96 antigen
English Text:: OD in dup 2 for GII.4 US95/96 antigen
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	940	940
.	Missing	6	946

SSII4UOM - Mean OD for GII.4 US95/96 antigen

Variable Name:: SSII4UOM
SAS Label:: Mean OD for GII.4 US95/96 antigen
English Text:: Mean OD for GII.4 US95/96 antigen
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	944	944
.	Missing	2	946

SSII4NC1 - Ab in dup 1 for GII.4 New Orleans ag

Variable Name:: SSII4NC1
SAS Label:: Ab in dup 1 for GII.4 New Orleans ag
English Text:: Ab in dup 1 for GII.4 New Orleans ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	921	921
.	Missing	25	946

SSII4NC2 - Ab in dup 2 for GII.4 New Orleans ag

Variable Name:: SSII4NC2
SAS Label:: Ab in dup 2 for GII.4 New Orleans ag
English Text:: Ab in dup 2 for GII.4 New Orleans ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	921	921
.	Missing	25	946

SSII4NCM - Mean Ab conc. for GII.4 New Orleans ag

Variable Name:: SSII4NCM
SAS Label:: Mean Ab conc. for GII.4 New Orleans ag
English Text:: Mean Ab conc. for GII.4 New Orleans ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	921	921
.	Missing	25	946

SSII4NO1 - OD in dup. 1 for GII.4 New Orleans ag

Variable Name:: SSII4NO1
SAS Label:: OD in dup. 1 for GII.4 New Orleans ag
English Text:: OD in dup. 1 for GII.4 New Orleans ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	921	921
.	Missing	25	946

SSII4NO2 - OD in dup. 2 for GII.4 New Orleans ag

Variable Name:: SSII4NO2
SAS Label:: OD in dup. 2 for GII.4 New Orleans ag
English Text:: OD in dup. 2 for GII.4 New Orleans ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	921	921
.	Missing	25	946

SSII4NOM - Mean OD for GII.4 New Orleans ag

Variable Name:: SSII4NOM
SAS Label:: Mean OD for GII.4 New Orleans ag
English Text:: Mean OD for GII.4 New Orleans ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	921	921
.	Missing	25	946

SSGIV1C1 - Antibody conc. in dup. 1 for GIV.1 ag

Variable Name:: SSGIV1C1
SAS Label:: Antibody conc. in dup. 1 for GIV.1 ag
English Text:: Antibody conc. in dup. 1 for GIV.1 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	867	867
.	Missing	79	946

SSGIV1C2 - Antibody conc. in dup. 2 for GIV.1 ag

Variable Name:: SSGIV1C2
SAS Label:: Antibody conc. in dup. 2 for GIV.1 ag
English Text:: Antibody conc. in dup. 2 for GIV.1 ag
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	867	867
.	Missing	79	946

SSGIV1CM - Mean antibody conc. for GIV.1 antigen

Variable Name:: SSGIV1CM
SAS Label:: Mean antibody conc. for GIV.1 antigen
English Text:: Mean antibody conc. for GIV.1 antigen
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 100000	Range of Values	867	867
.	Missing	79	946

SSGIV1O1 - OD in duplicate 1 for GIV.1 antigen

Variable Name:: SSGIV1O1
SAS Label:: OD in duplicate 1 for GIV.1 antigen
English Text:: OD in duplicate 1 for GIV.1 antigen
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	867	867
.	Missing	79	946

SSGIV1O2 - OD in duplicate 2 for GIV.1 antigen

Variable Name:: SSGIV1O2
SAS Label:: OD in duplicate 2 for GIV.1 antigen
English Text:: OD in duplicate 2 for GIV.1 antigen
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	867	867
.	Missing	79	946

SSGIV1OM - Mean OD for GIV.1 antigen

Variable Name:: SSGIV1OM
SAS Label:: Mean OD for GIV.1 antigen
English Text:: Mean OD for GIV.1 antigen
Target:: Both males and females 16 YEARS - 49 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0 to 3.5	Range of Values	867	867
.	Missing	79	946

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