Details Pertaining to
Pulmonary Data, Reviewed by Statistical Studies
Principal Investigator:
James Fozard
Collaborating Investigators: (none)
Year First Collected: 1962
Year Last Collected: 1993
Frequency of Collection: n/a
Subset Data Files on the VMS Cluster? None
Data Type Notes:
(none)
Descriptive History:
Information Type 118: Pulmonary Data reviewed by statistical studies, LSB
This includes Information Types 110-117 subject to modification 11/97.
Clarification of data element descriptions:
Card one, cols 01-01, names equipment used in spirometry, real time' refers to most recent
equipment used. On that equipment the spirogram, the flow volume record of the test, was
generated on the computer as the test maneuver was being performed. On earlier
equipment, a paper record was generated, that was later traced with an electronic pen to
give records comparable to the most recent.
Card one, cols 02-02, names persons who traced the paper records with electronic
pens.
Card one, col's 03-06, is a numerical name of record for purposes of evaluation at the
central quality control laboratory.
Card one, col's 07-07, is a judgement of whether the record was of acceptable quality by staff of
the central quality control laboratory. The checks were performed on a random subset of
records collected on the most recent equipment used.
Card one, cols 08-08, is a judgment of the quality of spirogram by the American Thoracic
Society criteria for research quality spirograms.
Card one, cols 09-22. Multiple trials were performed by each participant, and the two best
records were evaluated as shown in the data explanation. Second best means that the value
of the second was within about five percent of the first best.
Card one, cols 23-29, is a temperature and temperature correction factor used in
calculations.
Card one, cols 30-33, FEV1/Predicted FEV1. FEV indicates the volume of a maximally fast
expiration starting from a full inspiration. The numerical subscript, e.g., FEV1, is the time
in seconds over which FEV is measured, one second in this example. Predicted FEV1 is the
expected value (from BLSA data in our case) predicted from height, age and sex.
This explanation applies to all variables that includes "predicted."
Card one, cols 34-37, FVC Predicted. Total volume expired.
Card one, cols 38-46, as defined above.
Card one, cols 47-50, Predicted PEFR. Peak expiratory flow rates in one second.
Card one, cols 51-66, all involve FEF. This is a forced expiratory flow at a designated
volume point, or between two designated volume points. The values in these variables are
25%, 50%, and 75% of the total expiration. Columns 63-66 define the FEF between the
25th and 75th percentiles of the time volume curve that represents FVC.
Card two, cols 01-44, are the observed values for the participant as opposed to the
predicted.
Card two, cols 46-49, is the calculated percentile ranking of FEV1/ Height squared.
Card two, cols 50-53, is the observed ratio of FEV1/Height squared.
Card two, cols 54-57, maximum inspiratory pressure, not available on early data.
The data on Card one of Information types 110, 111, and 112 were the original data from
which the data on Information Type 118 were derived. I do not recommend their use. The
data on Card two of these information types concerned a study of "Nitrogen Washout" which
was reported in an unpublished thesis by Michael Baser. I would not recommend further
use of those data.
Information type 113, pulmonary disease questionnaire. This is a standard symptom
questionnaire and pulmonary disease and treatment history, self administered.
Information type 9, pulmonary disease classification. This is used early in BLSA history to
identify participants with pulmonary disease using chest X-rays, pulmonary records and
history. Goal was to identify pathology in participants, not evaluate quality of spirogram.
Information type 115-116. These were earlier versions of summary data.
Information type 117. This is a record of quality evaluation of spirograms collected since
1986.
This includes Information Types 110-117 subject to modification 11/97.
Clarification of data element descriptions:
Card one, cols 01-01, names equipment used in spirometry, real time' refers to most recent
equipment used. On that equipment the spirogram, the flow volume record of the test, was
generated on the computer as the test maneuver was being performed. On earlier
equipment, a paper record was generated, that was later traced with an electronic pen to
give records comparable to the most recent.
Card one, cols 02-02, names person who traced the paper records with an electronic
pen.
Card one, cols 03-06, was a numerical name of record for purposes of evaluation at a
central quality control laboratory.
Card one, cols 07-07, is a judgement of whether the record was of acceptable quality by staff of a
central quality control laboratory. The checks were performed on a random subset of
records collected on the most recent equipment used.
Card one, cols 08-08, is a judgement of quality of spirogram by American Thoracic Society
criteria for research quality spirograms.
Card one, cols 09-22, multiple trials were performed by each participant, and the two best
records were evaluated as shown in the data explanation. Second best means that the value
of the second was within about five percent of the first best.
Card one, cols 23-29, temperature and temperature correction factor used in
calculations.
Card one, cols 30-33, FEV1/Predicted FEV1. FEV indicates the volume of a maximally fast
expiration starting from a full inspiration. The numerical subscript, e.g., FEV1, is the time
in seconds over which FEV is measured, one second in this example. Predicted FEV1 is the
expected value (from BLSA data in our case) predicted from height, age and sex.
This explanation applies to all variables that includes "predicted."
Card one, cols 34-37, FVC Predicted. Total volume expired.
Card one, cols 38-46, as defined above.
Card one, cols 47-50, Predicted PEFR. This is a peak expiratory flow rate in one second.
Card one, cols 51-66, all involve FEF. This is a forced expiratory flow at a designated
volume point, or between two designated volume points. The values in these variables are
25%, 50%, and 75% of the total expiration. Columns 63-66 define the FEF between the
25th and 75th percentiles of the time volume curve that represents FVC.
Card two, cols 01-44, are the observed values for the participant as opposed to the
predicted.
Card two, cols 46-49, is the calculated percentile ranking of FEV1/ Height squared.
Card two, cols 50-53, is the observed ratio of FEV1/Height squared.
Card two, cols 54-57, maximum inspiratory pressure, not available on early data.
The data on Card one of Information types 110, 111, and 112 were the original data from
which the data on Information Type 118 were derived. I do not recommend their use. The
data on Card two of these information types concerned a study of "Nitrogen Washout" which
was reported in an unpublished thesis by Michael Baser. I would not recommend further
use of those data.
Information type 113, pulmonary disease questionnaire. This is a standard symptom
questionnaire and pulmonary disease and treatment history, self administered.
Information type 9, pulmonary disease classification. This is used early in BLSA history to
identify participants with pulmonary disease using chest X-rays, pulmonary records and
history. The goal was to identify pathology in participants, not evaluate quality of
spirogram.
Information type 115-116, earlier versions of summary data.
Information type 117, record of quality evaluation of spirograms collected since 1986.