| Course | PUBH 8546 Advanced Analysis of Community Health Data and Surveillance in Public Health |
|---|---|
| Week | Week 2 |
| Paper type | Case definition memo |
| Length | About 660 words, 4 pages |
| Format | Memo, APA 7 citations |
| School | Walden University |
| Program | PhD in Public Health |
| Updated | October 2026 |
Free sample paper for PUBH 8546 Week 2
Memorandum
To: Surveillance Epidemiologist, Northwater County Health Department
From: Doctoral Student, Community Health Data and Surveillance
Date: Month Day, Year
Re: Proposed case definition for suspected cold-related illness visits
The Definition
A visit counts as a suspected cold-related illness visit if it meets either of two arms.
The text arm searches the triage chief complaint for any of these terms, allowing for common misspellings and abbreviations: hypothermia, frostbite, frozen, cold exposure, exposure to cold, found outside together with cold or freezing, and immersion foot. A negation rule excludes matches preceded within three words by denies, no or negative for, so that "no frostbite" or "denies cold exposure" does not count.
The code arm accepts any discharge diagnosis in the following ICD-10-CM groups: hypothermia (T68), other effects of reduced temperature such as chilblains and immersion foot (T69), frostbite (T33 and T34), and exposure to excessive natural cold as an external cause (X31). It excludes hypothermia not associated with low environmental temperature (R68.0), hypothermia following anesthesia, and newborn hypothermia, none of which reflect weather exposure.
A visit meeting either arm counts once. Visits are assigned to the week of arrival and to the patient's residential ZIP code.
Why Two Arms
The text arm is fast. Chief complaints arrive within hours, which is what makes a syndromic feed useful for early warning (Henning, 2004). It is also imprecise: some matches will not be cold-related, and some cold injuries will be recorded under other words. The code arm is slower but more specific, since diagnosis codes reflect the clinician's final judgment. Joining the arms with or favors sensitivity, which suits a surveillance purpose in which missing a cluster costs more than reviewing a few false alarms.
Record Test
The test shows the code arm catching a case the text arm misses and the negation rule working as intended. It also shows that falls on ice, a real winter harm, are outside this definition by design; they belong to a separate injury definition.
Table 1
The definition applied to six illustrative records
| Chief complaint | Discharge code | Meets text arm? | Meets code arm? | Counted? | |
|---|---|---|---|---|
| "Hypothermia, found in car" | T68 | Yes | Yes | Yes | |
| "Frostbite fingers" | Not yet received | Yes | No | Yes | |
| "Fall on ice, wrist pain" | Fracture code | No | No | No | |
| "Denies cold exposure, chest pain" | Chest pain code | No, negated | No | No | |
| "Found outside, confused" | X31 | No, cold not mentioned | Yes | Yes | |
| "Low temp after surgery" | Hypothermia following anesthesia | No | No, excluded | No | |
Records are invented for illustration.
Who Stays Uncounted
Any surveillance definition counts only what reaches the data. These people will not be counted: those treated by paramedics without transport to a hospital; those warmed at shelters or warming centers; those who died before reaching care, who appear only in death records; those seen at the two facilities not yet sending data; and those whose chief complaint used other words and whose final code has not arrived. Cold deaths are a substantial share of weather-related deaths nationally (Berko et al., 2014), and many occur outside hospitals, so this list matters.
Choices Left Open
Two choices are deliberately left for review after the first winter. The first is whether to add terms such as "exposure" on its own, which would catch more cases but also many unrelated visits, such as chemical or sun exposure. The second is whether to count visits by people with no fixed address separately, since they may be at greatest risk and their recorded ZIP code may be a shelter's. Both choices affect counts, so each will be tested on the past winter's records before any change, and the version of the definition in use will be dated in every report.
Evaluation
The definition should be checked against a sample of full records each winter for predictive value positive and against hospital discharge data for sensitivity, in line with standard guidance on evaluating surveillance systems (German et al., 2001).
References
Berko, J., Ingram, D. D., Saha, S., & Parker, J. D. (2014). Deaths attributed to heat, cold, and other weather events in the United States, 2006-2010 (National Health Statistics Reports No. 76). National Center for Health Statistics.
German, R. R., Lee, L. M., Horan, J. M., Milstein, R. L., Pertowski, C. A., & Waller, M. N. (2001). Updated guidelines for evaluating public health surveillance systems: Recommendations from the Guidelines Working Group (MMWR Recommendations and Reports, Vol. 50, No. RR-13). Centers for Disease Control and Prevention.
Henning, K. J. (2004). What is syndromic surveillance? (MMWR Supplements, Vol. 53). Centers for Disease Control and Prevention.
The Walden PUBH 8546 Week 2 instructions
Case definition assignments ask students to specify exactly which records count as a case for a surveillance purpose. Prompts typically require the full definition, a rationale for each component, attention to sensitivity and specificity, and some test of the definition on sample records. Many also ask students to state who the definition will miss. Instructors expect definitions that leave no room for judgment calls by different analysts. Definitions described in general language, such as visits related to cold weather, cannot be applied consistently and usually lose points, as do definitions that ignore negation or codes that capture unrelated conditions.
How the PUBH 8546 Week 2 example is put together
The memo opens with both arms of the definition so the reader can apply it immediately. The text arm lists search terms and a negation rule; the code arm lists accepted and excluded diagnosis groups. A section explains why the arms are joined by or, trading specificity for sensitivity to suit surveillance. A table applies the rule to six invented records, showing a case caught only by codes, a negated complaint, and a surgical hypothermia excluded. A section on who stays uncounted lists people outside hospitals and outside the feed. Choices left open for review and an evaluation plan close the memo. A short paragraph also explains why falls on ice, a real winter harm, sit outside this definition by design and belong to a separate injury definition. Every term and code list is dated, so later versions can be compared.
Reading the PUBH 8546 Week 2 rubric
Graders generally assess precision, rationale, testing and honesty about limits. A definition stated so that two analysts would classify every record identically earns credit. Handling negation and excluding look-alike codes shows technical care. Explaining the sensitivity trade-off demonstrates understanding of surveillance goals. A record test that includes difficult cases, not just easy ones, shows rigor. Listing who the definition cannot capture, and why that matters for this condition, shows critical awareness. Memos that plan to evaluate the definition against another source, using recognized attributes, typically earn the highest marks. Leaving some choices open for testing on past records, rather than guessing, shows the iterative attitude that good surveillance definitions require. Graders also like definitions accompanied by a plan for checking them each winter.
PUBH 8546 Week 2 help from the desk
Write your definition as instructions a new analyst could follow without asking you anything. Decide whether you need text, codes or both, and how they combine. List the words people actually use, including misspellings, and the words that signal a negation. Check code lists for look-alike conditions to exclude. Then test the rule on a handful of tricky records and fix what fails. Finally, write down who your definition will never see. If your definition keeps catching the wrong records, we can produce a sample memo for your condition.
Get a PUBH 8546 Week 2 example written to your instructions
Attach your Week 2 memo instructions with the rubric, plus the indicator your section is defining. A memo with a two-arm rule, a record test and a named list of who falls outside it is back in 24-48h, and the first costs nothing. Every triage line in it is fabricated for teaching; the records your rule must sort are your own.
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PUBH 8546 Week 2 questions, answered
Where can I find a free PUBH 8546 Week 2 sample paper?
The full Week 2 case definition memo is shown above, defining a suspected cold-related illness visit.
What are the two arms of the definition?
A text arm searching chief complaints for cold-related terms and a code arm accepting cold-related diagnosis codes.
How is negation handled?
Matches preceded within three words by denies, no or negative for are excluded.
Which hypothermia codes are excluded?
Hypothermia unrelated to low environmental temperature, after anesthesia, and in newborns.
Who will the definition miss?
People treated outside hospitals, those at facilities not in the feed, and deaths before reaching care.