help for trauma -------------------------------------------------------------------------------
Title
db trauma -- ICD-9-CM Trauma
Version
Version 3.0.
ICDPIC Version 3.0 requires STATA 8.0 or higher. ICDPIC Version 3.0 has been tested in STATA 10 and STATA 11, but the authors believe it should also work without incident in STATA 8 and STATA 9. If you have any problems using ICDPIC Version 3.0 in STATA 8 or STATA 9, please inform the authors.
ICDPIC Version 3.0 may be installed from within STATA using the ssc command. If you installed a previous version of ICDPIC from the SSC archives website using the ssc command, we suggest that you first delete it by typing ssc uninstall icdpic followed by ssc install icdpic. Alternatively, you may use ssc install icdpic, replace. See help for ssc.
If you installed any previous ICDPIC files obtained directly from the authors, please delete them ALL (.ado, .hlp and .dta files) to avoid any conflicts with ICDPIC 3.0 files.
Please enter complete variable names in the ICDPIC Version 3.0 dialog boxes. Do not use abbreviations.
New to Version 3.0 is the addition of a dialog box (.dlg) file associated with each individual ICDPIC Version 3.0 program (.ado) file. To access the ICDPIC dialog box, and all the ICDPIC programs, type: db icdpic. Typing icdpic, as in earlier versions, will still work, but ONLY with icdpic. For example, to access the ICD-9-CM Trauma program directly, type: db trauma. Typing trauma, as in previous versions, will produce an error.
Fixed in ICDPIC Version 3.0 is the ability to use path\file names containing spaces.
Fixed in ICDPIC Version 3.0 is the ability to run in STATA 11.0.
Fixed in ICDPIC Version 3.0 is a bug that caused the triss program to crash if the rts variable was named anything other than "rts".
New in ICDPIC Version 3.0 (trauma program only) is the ability to choose whether an AIS value of 6 automatically forces an ISS of 75 or to automatically have all AIS values of 6 changed to an AIS value of 5 and then have the ISS calculated normally.
All dialog boxes in ICDPIC Version 3.0 have memory. Each time a dialog box is opened within the same STATA session, it will remember the values last entered.
All dialog boxes in ICDPIC Version 3.0 have the following buttons:
OK executes the program and removes the dialog box from the screen.
SUBMIT executes the program and leaves the dialog box on the screen. Note that if an error message is generated the dialog box may be minimized.
CANCEL removes the dialog box from the screen and does nothing. Clicking on the close icon of the dialog box does the same thing.
HELP leaves the dialog box on the screen and presents the program help file. The HELP button has a question mark on it.
COPY leaves the dialog box on the screen and copies the program command to the clipboard.
RESET resets the values of the controls in the dialog box to their initial state, just as if the dialog box were invoked for the first time. Each time a user invokes a dialog box, its controls will be filled in with the values the user last entered. RESET restores the control values to their defaults. The RESET button has an R on it.
Syntax
db trauma
The ICD-9-CM Trauma dialog box will open. Follow the instructions.
OR
db icdpic
The ICDPIC dialog box will open. Choose ICD-9-CM Trauma and click OK or Submit. The ICD-9-CM Trauma dialog box will open. Follow the instructions.
Description
trauma provides various classifications and characterizations of trauma based on ICD-9-CM diagnosis codes, specifically codes for Nature of Injury (N-Codes) and External Cause of Injury (E-Codes).
For each observation, for each valid N-Code, variables for data from the list below will be added to the user's data. Note: variables for diagnosis codes that are not valid N-Codes will have missing values.
Abbreviated Injury Scale (AIS) value ISS body region Barell body region by nature of injury diagnosis matrix category Anatomic profile component category
Variables for 4 E-Codes will be added to the user's data for each observation. Up to 4 valid E-Codes, excluding E-Code places (E849.X), will be taken from the diagnosis codes and placed in these variables. Variables for data from the list below will be added to the user's data for each of the 4 E-Code variables. Note: E-Code, and associated, variables for which there is not an E-Code will have missing values.
CDC Classifications for E-Codes (Mechanism, both major and minor, and Intent)
For each observation, variables for data from the list below will be added to the user's data.
Maximum AIS severity for each ISS body region Maximum AIS severity overall Injury Severity Score (ISS) New Injury Severity Score (NISS) Lowest CDC classification of external cause of injury mechanism for all E-Codes captured Trauma type (Blunt or Penetrating)
See also the Options and Remarks sections for IMPORTANT information on, and requirements for, trauma.
Options
ICD-9-CM diagnosis codes in the user's data may, or may not, contain a decimal point. Simply choose the option that applies to your data in the ICD-9-CM Trauma dialog box.
Remarks
The user's data must contain ICD-9-CM diagnosis codes. Diagnosis codes in the user's data must be of type string. A decimal point in the diagnosis codes is optional. Diagnosis codes should have a width of 5 (6 if a decimal point is present). The diagnosis code prefix must be the same for all diagnosis codes and numbered sequentially starting with 1, for example, dx1...dxN. External Cause of Injury codes (E-Codes) should be included in this set and must begin with a capital 'E'.
trauma adds the following variables, where appropriate, to a new copy of the user's data stored on disk:
sev_1-sev_n: AIS severity for diagnosis codes 1..n issbr_1-issbr_n: ISS body region for diagnosis codes 1..n brl_1-brl_n: Barell matrix category for diagnosis codes 1..n apc_1-apc_n: anatomic profile component category for diagnosis codes 1..n mxaisbr1-mxaisbr6: maximum AIS severity for each ISS body region maxais: maximum AIS severity over all ISS body regions xiss: computed injury severity score niss: computed new injury severity score ecode_1-ecode_4: up to 4 E-Codes are captured excluding E-Code places (E849.X) mechmaj1-mechmaj4: CDC external cause of injury major mechanism for each E-Code captured mechmin1-mechmin4: CDC external cause of injury minor mechanism for each E-Code captured intent1-intent4: intent for each E-Code captured lowmech: lowest CDC external cause of injury major mechanism for all E-Codes captured bluntpen: type of trauma, blunt or penetrating, based on value of variable mechmaj1
If a diagnosis code is not an N-Code, then its associated sev, issbr, brl and apc variables will contain missing values.
mxaisbr1-mxaisbr6 variables are defined as 0 if there are no valid N-Codes for that body region and 9 if there are no valid N-Codes with a known severity for that body region.
The maxais variable is defined as 0 if there are no valid N-Codes and 9 if there are no valid N-Codes with a known severity.
The xiss and niss variables are defined as 75 if maxais is 6. If there are no valid N-Codes, then they are defined as 0. If there are no valid N-Codes with both a known severity and a known body region, then they are defined as 99.
If an E-Code variable (ecode_1-e_code4) does not contain an E-Code then it, and its associated variables, (mechmaj, mechmin and intent) will contain missing values.
The bluntpen variable is defined as follows: P for penetrating trauma if the mechmaj1 variable is 0 or 4 and; B for blunt trauma if the mechmaj1 variable is 2, 5, 6, 7, 8, 9 or 13.
Nature of Injury Codes (N-Codes) included in both ntab_s1.dta and ntab_s2.dta:
800 - 904.9 910 - 929.9 940 - 957.9 (Note: burns, 940 - 949.5, are assigned AIS severity code 9 (Unknown)) 959 - 959.9
trauma requires the use of lookup tables ntab_s1.dta, ntab_s2.dta, etab_s1.dta and etab_s2.dta. These data tables are supplied. _s1 tables are for use with data without the decimal point in ICD-9-CM codes and _s2 tables are for data that include the decimal point. See help for icdpic, specifically the LOOKUP TABLES part of the Remarks section.
NOTES ON METHODOLOGY
trauma does not attempt to assign a specific AIS code for each N-Code, but only to classify injuries into a general severity and body region in order to allow for approximate severity scoring. Meredith and colleagues have pointed out that any mapping method will be less accurate than direct AIS coding by trained registrars, but a program like ICDPIC (or ICDMAP-90) may be useful when the latter is impractical or impossible. For calculation of severity scores, only the original version of the Abbreviated Injury Score (AIS) was used, as developed and published by the American Medical Association. Later versions of the AIS, with more body regions and updated definitions, have been developed by the American Association for Automotive Medicine, and are available from that organization. ICDPIC does not calculate these newer versions of the AIS.
Injury Severity Score (variable xiss in the output data) is calculated according to the classic description of Baker and colleagues, but only over codes that have both a known severity and body region.
NOTES ON VALIDATION
To a large extent, the ICD to AIS mapping is "self-validating", since it reflects the consensus of a large number of registrars with actual specific injuries. An interesting review of this general approach to decision making is given in Surowiecki's recent book on the "Wisdom of Crowds".
ISS calculated by ICDPIC (XISS in Table 1 below) was compared to that calculated by ICDMAP-90 (ISS90 in Table 1 below) for 300,176 cases in the 2002 NIS with a primary diagnosis of injury as defined above, excluding cases with a primary burn diagnosis. In 4,458 of these (1.5%), ICDMAP-90 was unable to assign an AIS score for any diagnosis.
For 248,825 of the remaining 295,718 cases in the 2002 NIS (84.1%), XISS was exactly the same as the ISS90 assigned by ICDMAP-90. When ISS was categorized as recommended by Copes and colleagues, 274,709 cases (92.9%) were assigned to the same category, and 294,358 (99.5%) to the same or an adjacent category (Table 1).
--------------------------------------------------------------------------- ---- | Table 1 | XISS > | --------------------------------------------------------------------------- ---- | | | 1-8 | 9-15 | 16-24 | 25-40 | 41-49 | 50-7 > 5 | ---------------------------------------------------------------- ---- | | 1-8 | 147,610 | 5,072 | 149 | 40 | 0 | > 3 | ---------------------------------------------------------------- ---- | | 9-15 | 8,734 | 106,646 | 1,651 | 170 | 1 | > 2 | ---------------------------------------------------------------- ---- | | 16-24 | 74 | 1,795 | 15,854 | 557 | 5 | > 4 | ---------------------------------------------------------------- ---- | ISS90 | 25-40 | 22 | 718 | 1,441 | 4,132 | 81 | > 14 | ---------------------------------------------------------------- ---- | | 41-49 | 0 | 0 | 41 | 255 | 175 | > 27 | ---------------------------------------------------------------- ---- | | 50-75 | 0 | 48 | 12 | 57 | 36 | 2 > 92 | ---------------------------------------------------------------- ---- | | * | 4,145 | 285 | 15 | 10 | 0 | > 3 | --------------------------------------------------------------------------- ----
* Unobtainable
Evaluating the most obvious discrepancies in Table 1, we discovered that the 60 cases given ISS90 of 50-75 by ICDMAP-90, but only XISS of 9-24 by ICDPIC, were entirely due to the ICD-9-CM diagnosis code 862.9 (open chest injury, not otherwise specified). Conversely, the 40 cases given ISS90 of 1-8 by ICDMAP-90, but XISS of 25-40 by ICDPIC, were mostly those where an injury region was ambiguous between head and face (and therefore not coded by ICDMAP-90), but had been assigned an AIS of 5 by contributors to NTDB (and therefore by ICDPIC).
Examples
None
Authors
David E. Clark, M.D.
Maine Medical Center, Portland, Maine, USA University of Vermont College of Medicine, Burlington, Vermont, USA Harvard Injury Control Research Center, Harvard School of Public Health, Boston, Massachusetts, USA
Correspondence to Dr. Clark, 887 Congress Street, Portland ME 04102 Email: clarkd@mmc.org
Turner M. Osler, M.D.
University of Vermont College of Medicine, Burlington, Vermont, USA
David R. Hahn
Maine Medical Center, Portland, Maine, USA
References
Baker SP, O'Neill B, Haddon WJ, Long WB. The injury severity score: A method for describing patients with multiple injuries and evaluating emergency care. J Trauma 1974;14:187-196.
Barell V, Aharonson-Daniel L, Fingerhut LA, et al. An introduction to the Barell body region by nature of injury diagnosis matrix. Inj Prev 2002;8:91-96.
Copes WS, Champion HR, Sacco WJ, et al. Progress in characterizing anatomic injury. J Trauma 1990;30:1200-1207.
Copes WS, Champion HR, Sacco WJ, Lawnick MM, Keast SL, Bain LW. The Injury Severity Score revisited. J Trauma 1988;28:69-77.
Meredith JW, Evans G, Kilgo PD, et al. A comparison of the abilities of nine scoring algorithms in predicting mortality. J Trauma 2002;53:621-629.
Osler T, Baker SP, Long W. A modification of the injury severity score that both improves accuracy and simplifies scoring. J Trauma 1997;43:922-925.
Rating the severity of tissue damage. I. The abbreviated scale. JAMA 1971;215:277-280.
Recommended framework for presenting injury mortality data. MMWR Morb Mortal Wkly Rep 1997;46:1-30.
Surowiecki J. The Wisdom of Crowds. Boston: Little,Brown; 2004.
Also see
help for aps
help for triss
help for ascot
help for icdpic
help for trauma