Table of Contents

Locator Record

Title: Methicillin-Resistant Staphylococcus Aureus (L35_C )
Contact Number: 1-866-441-NCHS
Years of Content: 2003 - 2004
First Published: November, 2006
Revised: NA
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:Methicillin-Resistant Staphylococcus aureus (MRSA)
Record Source: NHANES 2003 - 2004
Survey Methodology: NHANES 2003 - 2004 is a stratified multistage probability sample of the civilian non-institutionalized population of the U.S.
Medium: NHANES Web site; SAS transport files

Component Description

Staphylococcus aureus is one of the most common causes of skin and soft tissue infection in both the health care and community settings. Antimicrobial resistance in S. aureus has increased dramatically, particularly in the hospital, where the rapid emergence of methicillin-resistant S. aureus (MRSA) and the appearance of S. aureus isolates with resistance to vancomycin have led to concern that this organism may become untreatable with currently available antimicrobials. Previously limited to hospitals, MRSA infections have been increasingly reported in the community. However, no prospective, population-based prevalence study has been done to measure the prevalence of MRSA in the community, and no national surveillance exists to provide a reliable national population estimate.

Eligible Sample

Participants aged 1 year and older are tested.

Description of Laboratory Methodology

Nasal swabs were first examined for proper labeling and integrity, and then plated on mannitol salt agar (MSA), a selective media for the isolation of S. aureus. MSA plates were incubated at 37°C for 48 hours. Mannitol-fermenting colonies (yellow or gold) were selected from the MSA plates and subcultured to trypticase soy agar + 5% sheep blood plates (BAP) and incubated at 37°C overnight. MSA plates with little or no growth were re-incubated at 37°C overnight, and plates with non-mannitol fermenting growth were held at room temperature. These plates were reexamined the next day, and any yellow or gold colonies were subcultured to BAP.

Overnight cultures on BAP were first screened using Staphaurex, a rapid latex kit for the identification of S. aureus. A tube coagulase test using rabbit plasma with EDTA was then performed on Staphaurex-negative isolates from BAP with morphology consistent with S. aureus and Staphaurex-positive isolates with morphology inconsistent with S. aureus (non-hemolytic). Staphaurex-positive isolates and Staphaurex-negative tube coagulase-positive isolates were identified as S. aureus and saved for further testing. Staphaurex-positive tube coagulase-negative isolates were discarded.

S. aureus isolates were screened for methicillin resistance following the NCCLS disk diffusion method. Overnight cultures from BAP were plated on Mueller-Hinton (MH) agar, and a 1-μg oxacillin (OX) disk was placed on the inoculated plate. Zone diameters were measured and recorded after 24-hr incubation at 37°C (sensitive > 13 mm; intermediate = 11–12 mm; resistant < 10 mm).

Isolates resistant to OX (i.e., MRSA), intermediate to OX, and every 10th isolate sensitive to OX [i.e., methicillin-sensitive Staphylococcus aureus (MSSA)] by disk diffusion were saved for additional testing of organism characteristics. These tests included: antimicrobial susceptibility testing (minimum inhibitory concentration [MIC]) by broth microdilution using NCCLS reference methods; strain typing by pulsed-field gel electrophoresis (PFGE) using SmaI enzyme; singleplex polymerase chain reaction (PCR) for detection of enterotoxins, toxic shock syndrome toxin-1, and Panton-Valentine leukocidin (PVL) toxin; and SCCmec cassette typing by PCR.

There were no changes to equipment, lab methods, or lab site from the previous 2 years of NHANES. Some antimicrobial susceptibility testing was dropped from the 2003-2004 data file that was previously tested in 2001-2002. The tests were imipenem (LBXMI1 and LBXMI2), cefazolin(LBXMF1 and LBXMF2), ciprofloxacin (LBXMD1 and LBXMD2), and amoxicillin/k clavulanate (LBXMY1 and LBXMY2).

A detailed description of the laboratory method used can be found on the NHANES website.

Data Processing and Editing

Nasal swab specimens were processed, stored, and shipped to Division of Healthcare Quality Promotion, National Center for Infectious Diseases, National Centers for Disease Control and Prevention, Atlanta, GA for analysis. Detailed specimen collection and processing instructions are discussed in the NHANES LPM. Read the LABDOC file for detailed data processing and editing protocols. The analytical methods are described in the Description of the Laboratory Methodology section.

Detailed instructions on specimen collection and processing can be found on the NHANES website.

Laboratory Quality Assurance and Monitoring

The NHANES quality assurance and quality control protocols (QA/QC) meet the 1988 Clinical Laboratory Improvement Act mandates. Detailed QA/QC instructions are discussed in the NHANES Laboratory/Medical Technologists Procedures Manual (LPM). Read the LABDOC file for detailed QA/QC protocols.

A detailed description of the quality assurance and quality control procedures can be found on the NHANES website.

Analytic Notes

The analysis of NHANES 2003–2004 laboratory data must be conducted with the key survey design and basic demographic variables. The NHANES 2003–2004 Household Questionnaire Data Files contain demographic data, health indicators, and other related information collected during household interviews. They also contain all survey design variables and sample weights for these age groups. The phlebotomy file includes auxiliary information such as the conditions precluding venipuncture. The household questionnaire and phlebotomy files may be linked to the laboratory data file using the unique survey participant identifier SEQN.

S. aureus Present and Organism Identified as MRSA

If LBXMS1 = 1 and LBXM1 = 1, further organism characteristic testing was performed.

Isolates resistant to OX (i.e., MRSA), intermediate to OX, and every 10th isolate sensitive to OX (i.e., MSSA) by disk diffusion were saved for additional testing of organism characteristics. These tests included: antimicrobial susceptibility testing [minimum inhibitory concentration (MIC)] by broth microdilution using NCCLS reference methods; strain-typing by pulsed-field gel electrophoresis (PFGE) using SmaI enzyme; singleplex polymerase chain reaction (PCR) for detection of enterotoxins, toxic shock syndrome toxin-1, and Panton-Valentine leukocidin (PVL) toxin; and SCCmec cassette typing by PCR.

S. aureus Present and Organism Identified as MSSA

Every 10th isolate sensitive to OX (i.e., MSSA) by disk diffusion was saved for additional testing of organism characteristics. These tests included: antimicrobial susceptibility testing (minimum inhibitory concentration [MIC]) by broth microdilution using NCCLS reference methods, and strain-typing by pulsed-field gel electrophoresis (PFGE) using SmaI enzyme.

References

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 1 YEARS - 150 YEARS

LBXMS1 - S. aureus present 1

Variable Name:
LBXMS1
SAS Label:
S. aureus present 1
English Text:
S. aureus present 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 2442 2442
2 No 6562 9004
. Missing 175 9179

LBXM1 - MRSA 1

Variable Name:
LBXM1
SAS Label:
MRSA 1
English Text:
MRSA 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 133 133
2 No 2309 2442
. Missing 6737 9179

LBXMT1 - Tetracycline 1

Variable Name:
LBXMT1
SAS Label:
Tetracycline 1
English Text:
Tetracycline 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 352 352
2 Resistant 16 368
3 Intermediate 2 370
4 No Result 0 370
. Missing 8809 9179

LBXMZ1 - Trimethoprim/Sulfamethoxazole 1

Variable Name:
LBXMZ1
SAS Label:
Trimethoprim/Sulfamethoxazole 1
English Text:
Trimethoprim/Sulfamethoxazole 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 368 368
2 Resistant 2 370
3 Intermediate 0 370
4 No Result 0 370
. Missing 8809 9179

LBXMC1 - Clindamycin 1

Variable Name:
LBXMC1
SAS Label:
Clindamycin 1
English Text:
Clindamycin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 320 320
2 Resistant 50 370
3 Intermediate 0 370
4 No Result 0 370
. Missing 8809 9179

LBXME1 - Erythromycin 1

Variable Name:
LBXME1
SAS Label:
Erythromycin 1
English Text:
Erythromycin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 204 204
2 Resistant 166 370
3 Intermediate 0 370
4 No Result 0 370
. Missing 8809 9179

LBXMP1 - Penicillin 1

Variable Name:
LBXMP1
SAS Label:
Penicillin 1
English Text:
Penicillin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 27 27
2 Resistant 343 370
3 Intermediate 0 370
4 No Result 0 370
. Missing 8809 9179

LBXMV1 - Vancomycin 1

Variable Name:
LBXMV1
SAS Label:
Vancomycin 1
English Text:
Vancomycin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 370 370
2 Resistant 0 370
3 Intermediate 0 370
4 No Result 0 370
. Missing 8809 9179

LBXMO1 - Oxacillin 1

Variable Name:
LBXMO1
SAS Label:
Oxacillin 1
English Text:
Oxacillin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 237 237
2 Resistant 133 370
3 Intermediate 0 370
4 No Result 0 370
. Missing 8809 9179

LBXMG1 - Gentamicin 1

Variable Name:
LBXMG1
SAS Label:
Gentamicin 1
English Text:
Gentamicin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 368 368
2 Resistant 2 370
3 Intermediate 0 370
4 No Result 0 370
. Missing 8809 9179

LBXML1 - Levofloxacin 1

Variable Name:
LBXML1
SAS Label:
Levofloxacin 1
English Text:
Levofloxacin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 293 293
2 Resistant 62 355
3 Intermediate 15 370
4 No Result 0 370
. Missing 8809 9179

LBXMR1 - Rifampin 1

Variable Name:
LBXMR1
SAS Label:
Rifampin 1
English Text:
Rifampin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 368 368
2 Resistant 2 370
3 Intermediate 0 370
4 No Result 0 370
. Missing 8809 9179

LBAMMT1 - Molecular type 1

Variable Name:
LBAMMT1
SAS Label:
Molecular type 1
English Text:
Molecular Type 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
Molecular type 1 Value was recorded 370 370
< blank > Missing 8809 9179

LBXBL1 - B-lactamase 1

Variable Name:
LBXBL1
SAS Label:
B-lactamase 1
English Text:
B-lactamase 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Negative 27 27
2 Positive 0 27
3 No result 343 370
. Missing 8809 9179

LBXCD1 - Clinda induction (D) test 1

Variable Name:
LBXCD1
SAS Label:
Clinda induction (D) test 1
English Text:
Clinda induction (D) test 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 No inducible resistance detected 29 29
2 Inducible resistance detected 87 116
3 No result 254 370
. Missing 8809 9179

LBXCH1 - Chloramphenicol 1

Variable Name:
LBXCH1
SAS Label:
Chloramphenicol 1
English Text:
Chloramphenicol 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 266 266
2 Resistant 10 276
3 Intermediate 94 370
4 No Result 0 370
. Missing 8809 9179

LBXDX1 - Doxycycline 1

Variable Name:
LBXDX1
SAS Label:
Doxycycline 1
English Text:
Doxycycline 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 72 72
2 Resistant 0 72
3 Intermediate 0 72
4 No Result 298 370
. Missing 8809 9179

LBXDY1 - Daptomycin 1

Variable Name:
LBXDY1
SAS Label:
Daptomycin 1
English Text:
Daptomycin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 189 189
2 Nonsusceptible 1 190
3 No result 180 370
. Missing 8809 9179

LBXLZ1 - Linezolid 1

Variable Name:
LBXLZ1
SAS Label:
Linezolid 1
English Text:
Linezolid 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 370 370
2 Non susceptible 0 370
3 No result 0 370
. Missing 8809 9179

LBXQD1 - Quinupristin-dalfopristin 1

Variable Name:
LBXQD1
SAS Label:
Quinupristin-dalfopristin 1
English Text:
Quinupristin-dalfopristin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 254 254
2 Resistant 0 254
3 Intermediate 0 254
4 No Result 116 370
. Missing 8809 9179

LBXMS2 - S. aureus present 2

Variable Name:
LBXMS2
SAS Label:
S. aureus present 2
English Text:
S. aureus present 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 0 0
2 No 0 0
. Missing 9179 9179

LBXMT2 - Tetracyline 2

Variable Name:
LBXMT2
SAS Label:
Tetracyline 2
English Text:
Tetracyline 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXMZ2 - Trimethoprim/Sulfamethoxazole 2

Variable Name:
LBXMZ2
SAS Label:
Trimethoprim/Sulfamethoxazole 2
English Text:
Trimethoprim/Sulfamethoxazole 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXMC2 - Clindamycin 2

Variable Name:
LBXMC2
SAS Label:
Clindamycin 2
English Text:
Clindamycin 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXME2 - Erythromycin 2

Variable Name:
LBXME2
SAS Label:
Erythromycin 2
English Text:
Erythromycin 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXMP2 - Penicillin 2

Variable Name:
LBXMP2
SAS Label:
Penicillin 2
English Text:
Penicillin 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXMV2 - Vancomycin 2

Variable Name:
LBXMV2
SAS Label:
Vancomycin 2
English Text:
Vancomycin 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXMO2 - Oxacillin 2

Variable Name:
LBXMO2
SAS Label:
Oxacillin 2
English Text:
Oxacillin 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXMG2 - Gentamicin 2

Variable Name:
LBXMG2
SAS Label:
Gentamicin 2
English Text:
Gentamicin 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXML2 - Levofloxacin 2

Variable Name:
LBXML2
SAS Label:
Levofloxacin 2
English Text:
Levofloxacin 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXMR2 - Rifampin 2

Variable Name:
LBXMR2
SAS Label:
Rifampin 2
English Text:
Rifampin 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXBL2 - B-lactamase

Variable Name:
LBXBL2
SAS Label:
B-lactamase
English Text:
B-lactamase
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Negative 0 0
2 Positive 0 0
3 No result 0 0
. Missing 9179 9179

LBXCD2 - Clinda induction (D)

Variable Name:
LBXCD2
SAS Label:
Clinda induction (D)
English Text:
Clinda induction (D)
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 No inducible resistance detected 0 0
2 Inducible resistance detected 0 0
3 No result 0 0
. Missing 9179 9179

LBXCH2 - Chloramphenicol

Variable Name:
LBXCH2
SAS Label:
Chloramphenicol
English Text:
Chloramphenicol
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXDX2 - Doxycycline

Variable Name:
LBXDX2
SAS Label:
Doxycycline
English Text:
Doxycycline
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBXDY2 - Daptomycin

Variable Name:
LBXDY2
SAS Label:
Daptomycin
English Text:
Daptomycin
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Nonsusceptible 0 0
3 No result 0 0
. Missing 9179 9179

LBXLZ2 - Linezolid

Variable Name:
LBXLZ2
SAS Label:
Linezolid
English Text:
Linezolid
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Nonsusceptible 0 0
3 No result 0 0
. Missing 9179 9179

LBXQD2 - Quinupristin-dalfopristin

Variable Name:
LBXQD2
SAS Label:
Quinupristin-dalfopristin
English Text:
Quinupristin-dalfopristin
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Sensitive 0 0
2 Resistant 0 0
3 Intermediate 0 0
4 No Result 0 0
. Missing 9179 9179

LBAMMT2 - Molecular type 2

Variable Name:
LBAMMT2
SAS Label:
Molecular type 2
English Text:
Molecular type 2
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
< blank > Missing 9179 9179

LBXETA - Enterotoxin A

Variable Name:
LBXETA
SAS Label:
Enterotoxin A
English Text:
Enterotoxin A
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Positive 54 54
2 Negative 316 370
. Missing 8809 9179

LBXETB - Enterotoxin B

Variable Name:
LBXETB
SAS Label:
Enterotoxin B
English Text:
Enterotoxin B
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Positive 31 31
2 Negative 339 370
. Missing 8809 9179

LBXETC - Enterotoxin C

Variable Name:
LBXETC
SAS Label:
Enterotoxin C
English Text:
Enterotoxin C
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Positive 34 34
2 Negative 336 370
. Missing 8809 9179

LBXETD - Enterotoxin D

Variable Name:
LBXETD
SAS Label:
Enterotoxin D
English Text:
Enterotoxin D
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Positive 74 74
2 Negative 296 370
. Missing 8809 9179

LBXETE - Enterotoxin E

Variable Name:
LBXETE
SAS Label:
Enterotoxin E
English Text:
Enterotoxin E
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Positive 0 0
2 Negative 370 370
. Missing 8809 9179

LBXETH - Enterotoxin H

Variable Name:
LBXETH
SAS Label:
Enterotoxin H
English Text:
Enterotoxin H
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Positive 20 20
2 Negative 350 370
. Missing 8809 9179

LBXTSS - Toxic Shock Syndrome Toxin 1

Variable Name:
LBXTSS
SAS Label:
Toxic Shock Syndrome Toxin 1
English Text:
Toxic Shock Syndrome Toxin 1
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Positive 71 71
2 Negative 299 370
. Missing 8809 9179

LBXPVL - Panton Valentine Leukocidin

Variable Name:
LBXPVL
SAS Label:
Panton Valentine Leukocidin
English Text:
Panton Valentine Leukocidin
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Positive 26 26
2 Negative 344 370
. Missing 8809 9179

LBXSCC - SCCmec Type

Variable Name:
LBXSCC
SAS Label:
SCCmec Type
English Text:
SCCmec Type
Target:
Both males and females 1 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Type I 0 0
2 Type II 68 68
3 Type III 0 68
4 Type IV-No Subtype 18 86
5 Type Iva 36 122
6 Type Ivb 3 125
7 Type Ivc 7 132
8 Not Typable 1 133
9 No data 237 370
. Missing 8809 9179