This page provides an independent statistical analysis and educational interpretation of publicly reported results. ClinicalTrials.gov provides the official trial registry record.
1. Trial at a Glance
PATHOS was a completed clinical study investigating the development of COPD health care structure in primary care through extraction of medical record information covering a period of one decade.
| Feature | PATHOS |
|---|---|
| NCT ID | NCT01146392 |
| Acronym | PATHOS |
| Status | COMPLETED |
| Condition | Chronic Obstructive Pulmonary Disease |
| Lead sponsor | AstraZeneca |
| Sponsor type | INDUSTRY |
| Number of arms | 1 |
2. Clinical Question
Population
Primary care patients with chronic obstructive pulmonary disease.
Intervention
The registry describes a single-arm investigation of COPD health care structure rather than a comparative treatment intervention.
Comparator
No comparator arm was reported.
Primary question
How did COPD health care structure develop in primary care over the examined period?
3. Trial Design
Primary care COPD patients
Medical records
One decade
COPD health care
The ClinicalTrials.gov record describes PATHOS as a one-arm study with enrollment of 27,394 participants. The registry does not report randomization, crossover, factorial structure, interim analysis, or Bayesian methodology.
4. Endpoints
| Endpoint | Definition / Time frame |
|---|---|
| Describe the development of COPD health care structure in primary care. | Data will be extracted from the medical records on one occasion, covering a period of one decade. |
5. Planned Analysis
The registry identifies the primary objective as describing the development of COPD health care structure in primary care. The ClinicalTrials.gov record does not post statistical analyses or outcome estimates.
For a descriptive medical-record study, statistical analyses would typically focus on summarizing recorded characteristics, health care patterns, and changes observed across the defined period. The specific descriptive methods depend on the variables collected and the structure of the extracted records.
6. Statistical Methodology
Descriptive analysis of clinical records
The primary endpoint is descriptive in nature. Rather than comparing randomized treatment groups, the study objective is to characterize health care structure using information extracted from medical records.
Why descriptive methods fit this design
A single-arm observational description generally focuses on summarizing what was observed. Without a comparator group, treatment-effect measures such as hazard ratios, risk ratios, or between-group differences are not applicable.
Time frame interpretation
The endpoint specifies that medical records are extracted on one occasion while covering a period of one decade. This distinction separates the timing of data collection from the historical period represented by the records.
7. Statistical Methods Explained
Why is there no treatment effect estimate?
The registry reports one study arm. Without randomized comparison groups, a relative treatment effect cannot be estimated.
What does a one-time record extraction mean?
It means the data collection event occurs once, while the information extracted represents a longer historical period.
Why are confidence intervals not reported?
The ClinicalTrials.gov record does not report statistical estimates or confidence intervals for the primary endpoint.
How would descriptive data usually be summarized?
Descriptive studies commonly summarize frequencies, distributions, and patterns appropriate to the collected variables.
Why does study design determine statistical interpretation?
The design determines which questions can be answered. A descriptive single-arm study addresses characterization of health care structure rather than randomized comparative efficacy.
8. Limitations
- No comparator group: The registry reports one arm, limiting comparative interpretation.
- No posted statistical analyses: The registry does not provide formal analysis results.
- Endpoint scope: The primary endpoint describes health care structure rather than a treatment outcome.
- Record-based data: Interpretation depends on the completeness and characteristics of available medical records.
9. Why This Trial Matters Statistically
PATHOS illustrates how statistical interpretation depends on the scientific question and study design. Not every clinical study is designed to estimate treatment effects. Descriptive investigations can provide information about patterns of care, documentation, and health care structure.
| Concept | How it appears in PATHOS |
|---|---|
| Single-arm design | No randomized comparator group reported |
| Descriptive analysis | Primary objective focuses on describing COPD health care structure |
| Medical record extraction | Data collected from records covering one decade |
| Endpoint definition | Registry endpoint is descriptive rather than comparative |
10. Sources
- ClinicalTrials.gov record: PATHOS (NCT01146392)