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The rectangular data file included in the AIDS Public
Information Data Set contains one line of data for each AIDS case reported to
CDC. Each line contains 35 columns. The columns contain 16 variables
extracted from CDC's national AIDS data set.
| Column |
Variable |
Description |
| 1 |
age |
Age group at diagnosis of the first
AIDS-indicator opportunistic condition |
| 2 |
sexclass |
Sexual classification of patient |
| 3 |
race |
Race of patient |
| 4 |
categ |
Indicates which of the CDC AIDS case definition revisions the patient meets |
| 5-10 |
dxdate |
Month of diagnosis of first
AIDS-indicator opportunistic condition |
| 11-16 |
repdate |
Date when CDC first received information
about the case |
| 17 |
death |
Vital status of patient
|
| 18-19 |
transcat |
HIV transmission category |
| 20 |
multrisk |
Indicates if patient had more than one HIV risk factor |
| 21 |
birth |
Country of birth |
| 22 |
sexbi |
Sex with a bisexual man (women only)
|
| 23 |
sexiv |
Sex with an injecting drug user |
| 24 |
sexother |
Sex with a person with hemophilia or
with a transfusion recipient
|
| 25 |
sexhiv |
Sex with a person known to be infected with HIV or to have AIDS, but whose HIV risk factor is unknown |
| 26-31 |
adjwgt |
Reporting delay adjustment weight |
| 32-35 |
msa |
Region of residence at diagnosis of AIDS |
Each of these variables is coded alpha-numerically. The codes
used in the AIDS Public Information Data Set are described below.
Age (column 1)
This variable contains the patient's age when he or she was
first diagnosed with an AIDS-indicator disease.
| 0 |
= |
Less than 1 year old |
| 1 |
= |
1 to 12 years old |
| 2 |
= |
13 to 19 years old |
| 3 |
= |
20 to 24 years old |
| 4 |
= |
25 to 29 years old |
| 5 |
= |
30 to 34 years old |
| 6 |
= |
35 to 39 years old or age is missing |
| 7 |
= |
40 to 44 years old |
| 8 |
= |
45 to 49 years old |
| 9 |
= |
50 to 54 years old |
| A |
= |
55 to 59 years old |
| B |
= |
60 to 64 years old |
| C |
= |
65 years old or older |
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Sexclass (column 2)
Adult/adolescent males are classified according to their
sexual orientation.
| 1 |
= |
Adult/adolescent male who has sex only with other
men or sex is missing, or sexual orientation is missing |
| 2 |
= |
Adult/adolescent male who has sex with both men and
women |
| 3 |
= |
Adult/adolescent heterosexual male or pediatric
male |
| 4 |
= |
Female (both adult/adolescent and pediatric) |
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Race (column 3)
| 1 |
= |
White (not Hispanic) |
| 2 |
= |
Black (not Hispanic) |
| 3 |
= |
Hispanic |
| 4 |
= |
Asian/Pacific Islander |
| 5 |
= |
American Indian/Alaskan Native |
| 9 |
= |
Unknown |
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Categ (column 4)
This variable reflects changes made over time to the CDC
surveillance definition for AIDS. Only cases meeting the current (1993)
surveillance definition are included in this data set. Categ indicates
whether the patient also met the pre-1985, 1985, or 1987 surveillance
definition, and whether the diagnosis, if it meets the 1987 or 1993
definition, was definitive or presumptive. Cases that meet more than one of
these surveillance definitions are classified into the category listed first.
For more information about the 1993 definition, see
Morbidity and
Mortality Weekly Report, Recommendations and Reports, December 18, 1992.
| 1 |
= |
Case meets the pre-1985 surveillance definition |
| 2 |
= |
Case meets the 1985 surveillance definition |
| 3 |
= |
Case meets the 1987 surveillance definition and was
diagnosed definitively |
| 4 |
= |
Case meets the 1987 surveillance definition and was
diagnosed presumptively |
| 5 |
= |
Case meets the 1993 surveillance definition:
pulmonary tuberculosis, recurrent pneumonia, and/or cervical cancer
(definitive diagnosis) |
| 6 |
= |
Case meets the 1993 surveillance definition:
pulmonary tuberculosis and/or recurrent pneumonia (presumptive
diagnosis) |
| 7 |
= |
Case meets the 1993 surveillance definition, severe
HIV-related immunosuppression |
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Dxdate (columns 5 through 10)
This variable contains
the year and month in which the first AIDS-indicator condition was diagnosed.
Columns 5 through 8 contain the year;
columns 9 and 10 contain the month. Cases diagnosed before 1982 are coded
as “198199.” Cases whose month of diagnosis is unknown are coded as “99” in
the month portion of this variable.
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Repdate (columns 11 through 16)
This variable contains
the year and month in which CDC received the case report. Columns 11 through
14 contain the year; columns 15
and 16 contain the month. Cases reported during 1981 are coded as “198199.”
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Death (column 17)
| 0 |
= |
CDC has not received a death notification for this
case |
| 1 |
= |
CDC has been notified that this patient died |
Patients diagnosed
during the 2 most recent years are coded as “0” regardless of the patient's vital status. AIDS prevalence rates
calculated for the most recent two-year period should be interpreted with
caution. The rates calculated will be artificially high because all persons
diagnosed in this period are coded with a vital status of “0” (alive), even
if a death has been reported to CDC for that person. This is to prevent
inadvertent indirect identification of any record by linking a death date
inferred from this data set to other publicly available data sets which
contain death dates on individuals.
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Transcat (columns
18 and 19)
For surveillance purposes, AIDS cases are counted only once
in a hierarchy of transmission categories. Persons with more than one reported
HIV risk factor are classified in the category listed first in the transmission
category hierarchy, except for men with both a history of sexual contact
with other men and injecting drug use. They make up a separate category.
Persons with multiple reported HIV risk factors are indicated in the variable
multrisk.
“Men who have sex with men” cases include men who report sexual
contact with other men (i.e., homosexual contact) and men who report sexual
contact with both men and women (i.e., bisexual contact). “Heterosexual
contact” cases are in persons who report specific heterosexual contact
with a person with, or at increased risk for, HIV infection (e.g., an injecting
drug user).
Adults/adolescents born in, or
who had sex with someone born in, a country where heterosexual transmission
was believed to be the predominant mode
of HIV transmission (formerly classified as Pattern II countries by the
World Health Organization) are no longer classified as having heterosexually
acquired AIDS unless they meet the criteria stated in the preceding paragraph.
Similar to other cases in persons who were reported without information
about a behavioral or a transfusion risk factor, these cases are now classified
(in the absence of other risk factor information that would classify them
in another transmission category) as “no risk factor reported or identified” (see
Morbidity and Mortality Weekly Report, March 11, 1994). Children whose mother
was born in, or whose mother had sex with someone born in, a Pattern II
country are now classified (in the absence of other risk factor information
that would classify them in another transmission category) as “Mother
with/at risk for HIV infection: has HIV infection, risk factor not specified.”
“Risk factor not reported or identified” cases
are in persons with no reported history of exposure to HIV through any
of the routes listed
in the hierarchy of transmission categories. Risk not reported or identified
cases include persons who are currently under investigation by local health
department officials; persons whose HIV risk factor history is incomplete
because they died, declined to be interviewed, or were lost to follow-up;
and persons who were interviewed or for whom other follow-up information
was available and no HIV risk factor was identified. Persons who have an
HIV risk factor identified at the time of follow-up are reclassified into
the appropriate transmission category.
Adult/adolescent exposure categories
| 1 |
= |
Men who have sex with men |
| 2 |
= |
Injecting drug use |
| 3 |
= |
Men who have sex with men and inject drugs |
| 4 |
= |
Hemophilia/coagulation disorder |
| 5 |
= |
Heterosexual contact with a person with, or at
increases risk for, HIV infection |
| 7 |
= |
Receipt of blood transfusion, blood components, or
tissue |
| 8 |
= |
Risk not reported or identified |
Pediatric exposure categories
| 9 |
= |
Hemophilia/coagulation disorder |
| 10 |
= |
Mother with, or at risk for, HIV infection |
| 11 |
= |
Receipt of blood transfusion, blood components, or
tissue |
| 12 |
= |
Risk not reported or identified |
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Multrisk (column 20)
Multrisk is coded only for adult/adolescent patients (13 years old or older) and
indicates if the patient has HIV risk factors other than the one indicated
by transcat.
| 0 |
= |
Patient’s only HIV risk factor is that indicated by transcat |
| 1 |
= |
Patient has additional HIV risk factor(s) |
| 2 |
= |
Patient’s HIV risk factor is not reported or identified |
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Birth (column 21)
| 1 |
= |
Patient was born in the United States or its
dependencies and possessions, or place of birth was not specified |
| 2 |
= |
Patient was born outside the United States |
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Heterosexual risk factor information (columns 22 through
25)
These variables (sexbi, sexiv, sexother, and sexhiv)
contain additional exposure information for patients infected heterosexually.
All 4 variables are coded as follows:
| 0 |
= |
no |
| 1 |
= |
yes |
| 9 |
= |
missing/unknown |
The variable sexbi
is coded only for women (for men, the variable contains a blank). All
four variables contain “9” (missing/unknown)
for patients with hemophilia, regardless of whether the HIV risk factor
information is in fact unknown. This restriction is necessary in order to
comply with the Assurance of Confidentiality on page 5. Of the 4,596 AIDS
cases reported through December 1995 among adults/adolescents with hemophilia,
less than 4% also reported heterosexual contact with a person with, or at
increased risk for, HIV infection.
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Adjwgt (columns 26 through 31)
This variable contains an adjustment weight which, when used
as a weighting variable in a frequency tabulation, produces tabulations of
AIDS cases that are adjusted for delays in case reporting (see page 11 for a
discussion of delays in reporting). The weights are based on estimated
reporting delay distributions that take into account exposure, geographic,
and demographic variations in case reporting. The adjustment weights and the
resulting tabulations are not reliable for cases diagnosed during the most
recent 6 months. The Tools menu contains an adjusted weight option. If
you select this option, all subsequent tabulations you request will be
weighted accordingly.
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MSA (columns 32 through 35)
Metropolitan area of residence at diagnosis of AIDS is
identified for adult/adolescent patients residing in MSAs with 500,000 or
more population, according to the latest available official U.S. Bureau of
Census estimates. Each MSA is identified by a 4-digit code listed in Appendix
B. For adult/adolescent patients residing in an MSA with less than 500,000
population, in a non-metropolitan area, or whose metropolitan area of
residence is unknown, and for all pediatric patients, region of residence is
identified. The regional codes are:
| 1 |
= |
Northeast: Connecticut, ME, Massachusetts, New
Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and
Vermont |
| 2 |
= |
Midwest: Indiana, Illinois, Iowa, Kansas, Michigan,
Minnesota, Missouri, Nebraska, North Dakota, OH, South Dakota, and
Wisconsin |
| 3 |
= |
South: Alabama, Arkansas, Delaware, District of
Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland,
Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee,
Texas, Virginia, and West Virginia |
| 4 |
= |
West: Alaska, Arizona, California, Colorado, Idaho,
Hawaii, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and
Wyoming |
| 5 |
= |
U.S. dependencies, possessions, and independent
nations in free association with the United States: Guam, Puerto
Rico, the U.S. Virgin Islands, and the U.S. Pacific Islands listed
on page 8. |
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