| Course | NR 518 Population Health and Epidemiology in Nursing Practice |
|---|---|
| Week | 2 |
| Paper type | Case definition exercise |
| Length | About 1,170 words, 3 pages |
| Format | APA 7 student paper |
| School | Chamberlain University |
| Program | MSN |
| Updated | September 2026 |
Free sample paper for NR 518 Week 2
Case Definition Exercise: An Outcome Definition for Silicosis and an Exposure Definition for Engineered Stone Work, Each Written So Two Nurses on Different Streets Return the Same Count
Student Name
College of Nursing, Chamberlain University
NR 518: Population Health and Epidemiology in Nursing Practice
Instructor Name
Month Day, Year
Case Definition Exercise: An Outcome Definition for Silicosis and an Exposure Definition for Engineered Stone Work, Each Written So Two Nurses on Different Streets Return the Same Count
Purpose
This exercise writes two definitions for a county health department that wants to count silicosis among workers who fabricate engineered stone countertops. The first defines the outcome: who counts as a case. The second defines the exposure: who counts as an engineered stone worker. Each is written for a public health nurse who has never met the disease and must decide, from records and an interview, whether a person is in or out. The test is simple. Two nurses reviewing the same people, working in different parts of the county, should return the same count.
The need is real. Statewide surveillance in California received 1,817 reports of possible silicosis about 648 people from 2019 to 2024 and confirmed 296 cases, 243 of them associated with engineered stone (Flattery et al., 2025). More than half of the reported people were not confirmed. A definition decides which ones are.
Definition 1: The Outcome, a Case of Silicosis
Table 1 sets out the outcome definition in the form a surveillance nurse would use.
Table 1
Outcome Definition: Silicosis Case for County Surveillance
| Element | Criterion |
|---|---|
| Person | A person of any age who lives or works in the county |
| Time | Diagnosis, or first imaging meeting the clinical criterion, on or after January 1, 2019 |
| Clinical criterion (required) | Chest computed tomography read by a radiologist as consistent with silicosis, or lung tissue showing silicotic nodules or silica particles |
| Exposure history (required) | A documented history of work with a material containing crystalline silica |
| Excluded | Imaging findings attributed by the reviewing physician to another cause, such as sarcoidosis, after review |
| Case status | Confirmed: both required elements present. Not a case: either element absent. Pending: imaging present, work history not yet obtained |
Why the Outcome Definition Is Written This Way
The clinical criterion names the test rather than a symptom. Shortness of breath and cough are common and would sweep in people with asthma, pneumonia or heart failure. A chest radiograph alone was considered and rejected, because early silicosis can be missed on plain film and because reports vary in their wording. Naming computed tomography or tissue gives two nurses the same document to look for.
The exposure history is required but is not limited to engineered stone. Silicosis also occurs in miners, sandblasters and construction workers, and the county needs to count them too. Limiting the outcome definition to engineered stone would build the answer into the question. The link to engineered stone is made by the second definition, not the first.
The pending category exists because the most common gap in a report is the work history. A radiologist's report says nothing about the patient's job. Without a pending category, a nurse short of time might count the case or drop it, and two nurses would decide differently.
Definition 2: The Exposure, Engineered Stone Fabrication Work
Table 2 sets out the exposure definition.
Table 2
Exposure Definition: Engineered Stone Fabrication Work
| Element | Criterion |
|---|---|
| Material | Engineered stone, also called quartz or artificial stone: a manufactured slab made of crushed quartz bound with resin, identified by brand name, invoice or the worker's description |
| Task | Cutting, edging, grinding, polishing or drilling the material, or cleaning up its dust, as part of paid work |
| Duration | At least 6 months in total, in any number of jobs |
| Place | Any shop, job site or home workspace, in or outside the county |
| Ever or current | Exposure is ever-exposed if the criteria were met at any time; current if the person did such work in the last 12 months |
| Excluded | Installation only, with no cutting or finishing on site; sales or office work in a fabrication business |
Boundary Cases, With the Answer for Each
The exposure definition names the material separately from natural stone because the difference in hazard is large. Engineered stone can contain more than 90% crystalline silica, far more than granite or marble, which is why clusters of severe disease have appeared among the workers who cut it (Rose et al., 2019). A definition that lumped all stone together would blur the comparison the county most needs to make. The task list is broad on purpose: sweeping up dust by hand is included, because a worker who never runs a saw can still breathe what the saw produces.
A man who cut natural granite for ten years and engineered stone for four months. He meets the outcome definition if his CT is consistent, but not the exposure definition, because four months is under the six-month threshold. He is counted as a silicosis case with other silica exposure. The six-month threshold is arbitrary, and the definition says so; its job is to make two nurses agree, not to settle a biological question.
A woman who worked the front desk of a fabrication shop for three years. Not exposed under Table 2, since office work is excluded, even though dust may reach the office. If she develops silicosis, she is a case with an exposure that the definition does not capture, and the nurse should record her job in full so the definition can be revised if such cases appear.
An installer who sometimes trims a slab on site with a handheld saw. Exposed, because on-site cutting meets the task criterion. The exclusion covers installation only when no cutting is done.
A worker who does not know whether the slabs were quartz or granite. The nurse asks for the brand, the color patterns and whether the shop's invoices are available. If the material still cannot be identified, exposure is recorded as unknown, not assumed.
Testing the Definitions
Before use, the definitions were tested by giving the same ten de-identified records to two nurses who had not written them. They agreed on outcome status for nine of ten; the disagreement was a CT report describing "nodules possibly related to prior infection," which led to a sentence in the exclusion row requiring physician review for such wording. They agreed on exposure status for eight of ten; both disagreements involved the material, which led to the instruction to ask about brands and invoices. A definition that has never been tried on real records is only a draft.
The definitions also have limits the county should accept knowingly. Workers who are undocumented or uninsured may never get a CT, so the outcome definition will undercount among exactly the people most exposed. Fazio et al. (2023) found that 19% of the men in their case series were uninsured and 58% had a delayed diagnosis. A definition cannot fix access, but the county can report the undercount alongside the count.
References
Fazio, J. C., Gandhi, S. A., Flattery, J., Heinzerling, A., Kamangar, N., Afif, N., Cummings, K. J., & Harrison, R. J. (2023). Silicosis among immigrant engineered stone (quartz) countertop fabrication workers in California. JAMA Internal Medicine, 183(9), 991-998. https://doi.org/10.1001/jamainternmed.2023.3295
Flattery, J., Woolsey, C., Fazio, J. C., Gandhi, S. A., Heinzerling, A., Harrison, R. J., & Cummings, K. J. (2025). Silicosis surveillance in California, 2019-2024: Tracking an epidemic. American Journal of Public Health, 115(11), 1913-1921. https://doi.org/10.2105/AJPH.2025.308225
Rose, C., Heinzerling, A., Patel, K., Sack, C., Wolff, J., Zell-Baran, L., Weissman, D., Hall, E., Sooriash, R., McCarthy, R. B., Bojes, H., Korotzer, B., Flattery, J., Weinberg, J. L., Potocko, J., Jones, K. D., Reeb-Whitaker, C. K., Reul, N. K., LaSee, C. R., . . . Harrison, R. (2019). Severe silicosis in engineered stone fabrication workers: California, Colorado, Texas, and Washington, 2017-2019. MMWR. Morbidity and Mortality Weekly Report, 68(38), 813-818. https://doi.org/10.15585/mmwr.mm6838a1
Reading the NR 518 Week 2 instructions
In Week 2 you write case definitions, usually for a disease or condition and sometimes for the exposure being studied. Prompts commonly ask for person, place and time criteria, clinical or laboratory criteria, and categories such as confirmed, probable or suspected, along with a justification for each choice. Some sections ask you to compare your definition with an official one. A strong definition is operational: someone who has never seen the condition could apply it to a record and reach the same answer as you. Write in terms of documents and findings a nurse can check, and state what is excluded. Include edge cases with answers. Keep within your section's page limit and cite the sources behind your criteria.
How this NR 518 Week 2 example is built
The example begins by explaining why the definitions matter, using state surveillance figures showing that fewer than half of reported possible cases were confirmed. Table 1 sets out the outcome definition, and a section explains three choices: naming the test rather than symptoms, requiring a silica work history without limiting it to engineered stone, and including a pending status. Table 2 sets out the exposure definition, with a paragraph on why engineered stone is separated from natural stone. Four boundary cases, from a short-tenure granite cutter to an installer who trims on site, are resolved. The last section reports a test on ten records and admits the undercount among uninsured workers.
Reading the NR 518 Week 2 grading rubric
The rubric for case definitions usually rewards clarity, completeness of criteria, justification and practical usability. Graders look for person, place and time elements, a clinical criterion that can be verified, and clear categories. Justification earns points when each choice is explained by what it prevents or allows. Boundary cases with stated answers often lift the usability score, because they show the definition working. A criterion on sources expects the definition to reflect published or official practice where one exists. Tables should follow APA 7 conventions, and the prose should be concise; a definition buried in long paragraphs is harder to apply and is often marked down for that reason.
NR 518 Week 2 help from the desk
The mistake that costs most is a definition built on symptoms or vague terms, such as shortness of breath or suspected disease, which two nurses will read differently. Name the document or finding instead. Another problem is quietly building the answer into the definition, for example requiring engineered stone exposure to count as a silicosis case at all, which makes any comparison meaningless. Students also forget a category for incomplete information and so force nurses to guess. Test your definition on a few records before submitting and report what changed. Finally, state the definition's limits, such as undercounting people with poor access to testing, rather than leaving the grader to find them.
Get a NR 518 Week 2 example written to your instructions
Send the worksheet your section issued with the condition it names, and a custom NR 518 Week 2 exercise is written to that form and back inside 24 to 48 hours, the first one free. If your classroom supplies its own tier language, send that too and the definitions are built inside it.
More NR 518 papers and MSN samples
- NR 518 Week 1: Discussion Post, Exposure and Group
- NR 518 Week 3: Measures of Association Exercise
- NR 518 Week 4: Study Design Comparison
- NR 518 Week 5: Outbreak Investigation Write-up
- NR 518 Week 6: Risk Factor Analysis
- NR 518 Week 7: Prevention Program Plan
- NR 518 Week 8: Population Health Paper
- NR 516 Week 2: Searchable Question Exercise
- NR 513 Week 2: Standards Analysis, Phase I Staffing
- NR 510F Week 2: Competency Self-assessment
- NR 510 Week 2: Role Description Analysis
NR 518 Week 2 questions, answered
Does the definition have to be the official one?
Where a published one exists for the condition, most sections want it named and then adapted to the setting in front of you, with the changes visible. Where none exists you write your own and say what you drew on. What loses ground is copying a national definition whole and leaving in criteria that could not be applied on the ground where your cases are.
Should the definition be wide or narrow?
It depends on what you are about to do with it. Early, while you are still finding people, wide is safer, because a case you never count cannot be interviewed. Later, when you are comparing groups, narrow protects the comparison from people who were never really ill. Strong exercises write both and label which count came from which.
How many edge cases are enough?
Three or four, chosen because they are genuinely hard rather than because they are easy to resolve. One who meets the symptoms and has no link to the place, one whose onset sits just outside the window, one who was exposed and never became ill. Placing each one shows the definition working, and that demonstration is what the week is actually buying, not the definition itself.
Where can I find a free NR 518 Week 2 sample paper?
The two silicosis definitions above, with their boundary cases and test results, make up the full NR 518 Week 2 paper, open to read. For definitions of another condition, name it on the request page and a free set of definitions is drafted.
Should my NR 518 case definition be wide or narrow?
That depends on its use. A surveillance definition should be specific enough that nurses agree, with a pending category for incomplete records. The sample is narrow on the clinical test and broad on the kind of silica work.