PHLT 8068 Week 10 Study Limitations Memo Example

Course	PHLT 8068 Dissertation Seminar V
Week	Week 10
Paper type	Limitations memo
Length	About 860 words, 5 pages
Format	Memo, APA 7 citations
School	Walden University
Program	PhD in Public Health
Updated	October 2026

Free sample paper for PHLT 8068 Week 10

Memorandum

To: Dissertation chair and committee

From: Doctoral candidate

Date: June 15, 2026

Re: Study-specific limitations for chapter 5, organized by stage

How the Memo Is Organized

This memo lists only threats specific to this survey. Sentences that could appear in any cross-sectional study, such as "causality cannot be inferred," appear once in chapter 5 and are not repeated here. Each threat is placed at the stage where it arose: recruitment, measurement, exposure assessment or design. Each receives four parts: what happened, which way it likely moved the estimates, what the study did about it and what remains. Stating direction matters because a committee can judge a limitation that pushes results toward the null very differently from one that could manufacture an association (Rothman et al., 2008).

What this page is doingCommitting to state a direction for every threat keeps the memo from becoming a list of worries with no consequence for the results.

Recruitment

Owners Who Kept Interviewers Out

What happened: owners at 37 of 64 salons visited declined, so their workers could be reached only through the community channel. Direction: if refusing owners ran salons with poorer ventilation, the sample underrepresents unventilated stations; that would narrow the range of exposure and likely bias the ventilation association toward the null. Response: the community channel reached some of these workers, and channel was adjusted for. What remains: the refusing salons' conditions are unknown. Low salon participation is a documented problem in this field; Harris-Roberts et al. (2011) recruited only a small minority of the salons they approached.

A Connected Community Sample

What happened: community recruits came through one organization's network. Direction: members may be more aware of chemical hazards and more likely to report symptoms, inflating prevalence in that channel. Response: prevalence by channel was reported and differed by under two points. What remains: workers outside both the salons and the network are invisible.

Measurement

Symptoms Reported Near the Owner

What happened: before February 10, salon interviews were held at the workstation, sometimes within earshot of the owner. Direction: workers may have underreported symptoms they feared would reflect on the salon, biasing prevalence downward. Response: off-site and phone options were offered from February 10, and interview setting was recorded. What remains: about 30 salon interviews took place before the change.

Four-Week Recall

What happened: symptoms were recalled over four weeks. Direction: recall error is likely nondifferential by ventilation status, which would push associations toward the null. Response: the window was kept short and the outcome required improvement away from work, a feature that anchors the memory to a contrast. What remains: some misclassification.

The Reworded Eye Item

What happened: a back-translation check in the first week led to new wording for the eye question. Direction: the earlier wording, read as an eye disease, likely produced underreporting among Vietnamese-language interviews. Response: a sensitivity analysis excluding the 21 early interviews changed the ventilation estimate by 0.01. What remains: little.

What this page is doingGiving the size of the sensitivity result, not just its existence, lets the committee see how much a threat could matter.

Exposure Assessment

Ventilation Observed Once, or Reported

What happened: interviewers observed each consenting salon's stations on one visit, and community recruits reported their own. Direction: a single visit may catch equipment on or off by chance; self-report may overstate equipment use. Both would blur the comparison and push toward the null. Response: the restriction to observed ventilation gave a similar estimate. What remains: whether equipment ran on other days. Measured exposures in earlier work show that ventilation forms vary in how well they lower concentrations (Quach et al., 2011), and a yes or no checklist cannot capture that range.

Mask Type Not Recorded

What happened: the survey asked whether workers usually wore a mask, not which kind. Direction: lumping vapor-ineffective masks with any respirators would dilute any real benefit toward the null. Response: interviewer notes were summarized in chapter 5. What remains: the mask result cannot be interpreted as evidence about respirators.

Design

One Moment in Time

What happened: exposure and symptoms were measured together. Direction: the most important consequence is reverse order in protective behavior: symptomatic workers may adopt masks or seek ventilated stations, which could hide real benefits. Response: the discussion names this possibility for masks. What remains: the ventilation association could be understated for the same reason.

Unmeasured Differences Between Salons

What happened: salons with ventilated tables may be newer or use different products. Direction: this could exaggerate the ventilation association. Response: salon type was adjusted for. What remains: product use was not recorded, and this is the threat most likely to move the estimate away from the null.

Threats Considered and Set Aside

Two threats raised in the proposal defense proved minor in practice. Interviewer differences were checked by comparing symptom prevalence across the three interviewers within language groups, and the differences were small. Seasonal variation, a concern because salons may close windows in colder months, was examined by comparing prevalence in February and March with April and May; the later months were slightly lower, consistent with more open windows, but the ventilation association was similar in both periods.

What the Memo Leaves for Chapter 5

Each threat will appear in chapter 5 in condensed form, grouped by direction, so a reader can see that most plausible biases push the main associations toward the null and one, unmeasured salon differences, could push the ventilation result away from it.

References

Harris-Roberts, J., Bowen, J., Sumner, J., Stocks-Greaves, M., Bradshaw, L., Fishwick, D., & Barber, C. M. (2011). Work-related symptoms in nail salon technicians. Occupational Medicine, 61(5), 335-340. https://doi.org/10.1093/occmed/kqr096

Quach, T., Gunier, R., Tran, A., Von Behren, J., Doan-Billings, P.-A., Nguyen, K.-D., Okahara, L., Lui, B. Y.-B., Nguyen, M., Huynh, J., & Reynolds, P. (2011). Characterizing workplace exposures in Vietnamese women working in California nail salons. American Journal of Public Health, 101(S1), S271-S276. https://doi.org/10.2105/AJPH.2010.300099

Rothman, K. J., Greenland, S., & Lash, T. L. (2008). Modern epidemiology (3rd ed.). Lippincott Williams & Wilkins.

PHLT 8068 Week 10 instructions, in plain terms

The tenth week commonly asks for a memo or draft section on the study's limitations. Faculty expect limitations specific to the study rather than generic statements, each explained in terms of how it arose, how it may have affected results, the steps taken against it and the uncertainty left over. Stating the likely direction of each bias is increasingly expected, because it tells readers whether results are probably conservative or possibly inflated. Organizing by stage, such as recruitment, measurement, exposure and design, helps readers follow. Sensitivity analyses that address a threat should be cited with their results. The memo often runs four to five pages and feeds a condensed limitations section in chapter 5. Methods sources on bias and study-specific evidence support the reasoning.

Inside the PHLT 8068 Week 10 example

The memo opens by excluding generic limitations and committing to four parts for every threat, citing an epidemiology text on why direction matters. Recruitment covers refusing owners and the connected community sample, with a salon study cited on low owner participation. Measurement covers interviews near owners, four-week recall and the reworded item, the last with the size of its sensitivity result. Exposure assessment covers single-visit or self-reported ventilation and unrecorded mask type, citing measured exposure work. Design covers reverse order in protective behavior and unmeasured salon differences, the one threat most likely to inflate the ventilation association. A section explains two threats checked and set aside, interviewer differences and season. The memo closes by explaining how chapter 5 will group the threats by direction.

PHLT 8068 Week 10 rubric: what earns full marks

Instructors grade limitations work on specificity, reasoning and balance. Generic statements earn little; the sample's threats could not be pasted into another study. Stating the direction of each bias, with a reason, is credited heavily because it lets readers judge whether results are conservative. Reporting what was done about each threat, including sensitivity results with their size, shows the limitations were managed rather than merely listed. Identifying the one threat likely to inflate the main association demonstrates honesty. Explaining threats checked and found minor shows thoroughness. Organization by stage, consistent four-part treatment and accurate citation of methods sources complete the criteria, along with a clear link to how the discussion chapter will use the memo.

Common PHLT 8068 Week 10 mistakes, and how to avoid them

Limitations sections lose credibility when they read like a checklist copied from a textbook. "Self-report may be biased" says nothing unless you explain which way and why, in your study. Give each threat its direction and your reasoning. Another common problem is listing limitations without saying what you did about them; if you ran a sensitivity analysis, report its result. Students also tend to omit the threat that most worries them, which a committee member will raise anyway. Name it first. Avoid overstating limitations so much that the results seem worthless; balance matters. Group threats by stage so readers can follow. Finally, make sure each limitation appears consistently in chapter 5. A free custom limitations memo can be written for your study's design and data.

Get a PHLT 8068 Week 10 example written to your instructions

Point the desk to your methods and results chapters, your deviations table, and the Week 10 memo prompt with its rubric. Threats are drawn from your own study's stages, each given a likely direction, what was done and what remains, with no apology anywhere. The first memo is free and arrives within 24 to 48 hours. The survey behind it is invented.

More PHLT 8068 papers and PhD in Public Health samples

PHLT 8068 Week 10 questions, answered

Where can I find a free PHLT 8068 Week 10 sample paper?

The complete Week 10 limitations memo is on this page, tracing nine threats in a composite nail technician survey to recruitment, measurement, exposure assessment and design, each with direction, response and what remains. The references are real.

How is a limitation different from a deviation?

A deviation is a change from the approved plan, recorded in the methods chapter with its reason. A limitation is a weakness that affects how results can be interpreted, whether or not the plan changed. Some deviations create limitations, such as the sample's reworded item.

Why state the direction of each bias?

Because readers judge results differently depending on whether biases likely pushed them toward or away from no association. The sample shows most of its threats point toward the null, making its main associations probably conservative, while one could inflate the ventilation result.

Should limitations suggest future research?

Briefly, where a limitation points to a study that could address it. The sample's memo leaves most suggestions to chapter 5, but its points about mask type and unmeasured salon differences lead directly to the future studies proposed there.

How many limitations should a dissertation list?

Enough to cover the threats that could change interpretation, usually six to ten for a survey. The sample lists nine specific threats and explains two others checked and set aside, rather than adding generic statements to look thorough.