Integrating Addiction Treatment and HIV Services Into Primary Care Clinics in Ukraine: Complete Statistical Analysis

1. Trial at a Glance

This page covers the registry results for Integrating Addiction Treatment and HIV Services Into Primary Care Clinics in Ukraine (NCT04927091), a randomized na study. The primary outcome is Average Percentage of Recommended Quality Health Indicator Services Accessed by Participants to Assess Efficacy.

2. Clinical Question

The trial's stated aims included comparing a composite quality-health-indicator score and individual indicators, as well as quality of life and stigma. Its primary endpoint is specifically the average percentage of recommended services accessed. The posted primary result compares adjusted averages for the primary-care and specialty-clinic groups. It does not report results for quality of life, stigma, or the individual services in the record summarized by these estimates.

The comparison is relevant to the organization of HIV and addiction care: it asks whether access to a broad set of recommended services differs across care settings. The result describes group-level service access, not whether each participant received every recommended service or whether a particular service was responsible for the group average.

3. Trial Design

The registry record describes a randomized, parallel-group trial with no masking. It lists Yale University as sponsor and the status as completed. The recorded start date is 2017-05-01, and the primary completion date is 2024-06-30. Enrollment is listed as 1590.

The study brief describes a stratified, phase-in, controlled design over 24 months. It anticipated 1,350 people who inject drugs receiving MMT and described three planned groups: specialty addiction clinics, ECHO-IC/QI-enhanced primary care, and ECHO-IC/QI-enhanced primary care with pay-for-performance incentives. The brief also describes 13 regions as clusters and 39 clinical settings. These descriptions do not fully specify how randomization was conducted or what unit was assigned.

The posted primary result presents two categories: Primary Care Centers and Specialty Addiction Treatment Clinics. Their reported group sizes are 950 and 509, respectively. The record does not explain how the primary-care result category relates to the two primary-care groups described in the study brief, so the posted comparison should be read using the categories as reported rather than assuming how those groups were combined.

The primary outcome was assessed every 6 months up to 24 months, but the description of the posted primary result identifies adjusted average values at 24 months. The record therefore supports interpretation of that reported time point; it does not provide a sequence of estimates from which to describe changes over follow-up. Arm descriptions in the registry record are empty, limiting the detail available about what participants received in each posted group.

4. Participant Flow and Accounting

The registry reports how participants moved through each stage of the study. All counts below are exactly as posted; missing counts are not inferred from other stages.

Before assignment: A total of 1590 participants were randomized but 131 dropped out prior to starting the trial. Participants were either randomized to a primary care center or a specialty addiction treatment clinic. Clinics were not randomized.

Overall Study

5. Baseline Characteristics

The table reproduces the baseline characteristics posted in the registry, which describe the participants analysed at baseline and help show whether the randomized groups were comparable.

Population: Baseline characteristics presented for all completers.

6. Primary Endpoint

The registry lists the primary outcome as Average Percentage of Recommended Quality Health Indicator Services Accessed by Participants to Assess Efficacy, measured over every 6 months up to 24 months.

The primary endpoint is the average percentage of recommended Quality Health Indicator screenings and services accessed by participants. It is a continuous measure expressed as a percentage of 17 recommended services. The listed services range from general medical examination and laboratory tests to HIV-related screening and treatment, tuberculosis services, and aspects of MMT.

A composite percentage can describe the breadth of service access across several areas of care rather than focusing on a single service. It can be useful when a study asks whether care is comprehensive across a package of recommended activities. The result is an average across participants, however, and does not show the distribution of individual scores. It also does not indicate which specific services account for a higher or lower average.

The outcome description says that the posted values are adjusted averages at 24 months. The registry record does not report which variables were included in the adjustment or how the average was calculated. Although the endpoint timeframe is every 6 months up to 24 months, the primary result described is the 24-month estimate. It should therefore be interpreted as a group-level summary at that time point, not as a measure of each participant's full care history or of change over time.

7. Why No Re-analysis Is Shown

8. Statistical Interpretation

9. Statistical Methods Explained

The registry record reports a continuous endpoint summarized as a mean with a 95% confidence interval. It identifies the primary result as adjusted average values at 24 months. The exact statistical model, adjustment variables, and variance calculation are not reported in the registry record, so the method can be described only at the level of the reported estimand and summary statistics.

What does a mean represent?

For a continuous outcome, a mean is a group-level summary of observed values. In this trial, the underlying measure is the percentage of recommended services accessed. An average gives a concise description of service access across a group, but it can conceal variation: participants may have different service-access profiles even when the group average is the same. The reported group averages do not reveal the distribution of individual values or the contribution of each service to the composite.

Because the endpoint is expressed as a percentage of a defined set of recommended services, it summarizes coverage across that set. It is not a count of participants and should not be read as a percentage of participants who received all services. The outcome description lists 17 services, but does not report service-specific results alongside the primary averages.

How should the confidence intervals be read?

A confidence interval expresses uncertainty around an estimated quantity under the statistical procedure used. The 95% intervals reported for the group averages are 62.3 to 65.3 for Primary Care Centers and 52.8 to 56.6 for Specialty Addiction Treatment Clinics. A confidence interval is not a range containing most individual participant values. Nor does a pair of group-specific intervals replace a confidence interval for the difference between groups. The registry record does not report a direct interval for that contrast or a p-value for the primary comparison.

Intervals depend on the analysis and its assumptions. Their interpretation is constrained because the record does not report the model, adjustment covariates, or how any clustering was handled. The study brief describes regions as clusters and identifies clinical settings, but the precise assignment structure and analysis of those groupings are not reported. In clustered or otherwise grouped data, observations may be correlated within a setting or region. As a general statistical matter, accounting for that dependence can affect uncertainty estimates; the record does not say whether or how it was addressed.

What does adjustment tell the reader?

The description calls the reported averages adjusted. In general, adjustment means that an analysis accounts for selected measured variables when estimating a result. It does not identify which variables were included, whether the model was prespecified, or how the adjusted values relate to unadjusted group averages. Those specifics are not reported in the registry record. Accordingly, the posted estimates should be described as adjusted, without attributing the adjustment to any particular participant or clinic characteristic.

Randomized allocation can support a comparison of assigned groups, but interpretation also depends on the analysis population, missing outcome data, adherence to assignment, and appropriate treatment of the design. The registry record does not report enough detail to assess these elements. The posted comparison categories also differ in presentation from the three groups in the study brief, and their relationship is not explained. This limits interpretation of the estimand: it is clear which two labels accompany the posted averages, but not how the primary-care category was formed from the planned groups.

How do planning illustrations differ from trial results?

The sample-size assumptions described in the record define planning illustrations based on the observed effect, with a two-sided significance level of 0.05, equal allocation, and a normal approximation. The intended effect is described as a stated fraction of the observed effect. Such calculations illustrate the number of participants per arm that a hypothetical study might require under those assumptions. They are not the trial's original design justification and are not observed power. The registry record does not report the trial's own sample-size justification. These illustrations do not alter or add evidence to the observed endpoint results.

No recalculated group comparison is needed to describe the posted result, and the record does not flag a discrepancy between a sponsor analysis and a recalculation. The values to interpret are the adjusted averages and their reported confidence intervals. Any further claim about model choice, statistical significance, causal effect, or robustness would require analysis information that is not reported in the registry record.

10. Multiplicity, Missing Data and Analysis Populations

The study brief names several outcomes beyond the primary composite, including individual quality-health-indicator scores, quality of life, and stigma. The registry record lists two secondary outcomes concerning recommended primary and specialty quality-health-indicator services. It reports three outcome measures overall. These multiple outcomes create the general possibility of multiplicity: when several outcomes or comparisons are examined, the chance of at least one apparently unusual result can increase. The registry record does not report a multiplicity adjustment, a hierarchy among secondary outcomes, or a prespecified strategy for interpreting multiple tests.

Missing-data methods are not reported in the registry record. The record does not describe how participants without an observed 24-month outcome were handled, whether missingness differed across groups, or whether any sensitivity analyses were conducted. It also does not report the analysis population, such as whether the estimate follows randomized assignment or is restricted by treatment received or outcome availability. These omissions limit assessment of possible bias in the posted averages.

The primary endpoint is described as measured every 6 months up to 24 months, while the posted primary values are adjusted averages at 24 months. The record does not provide a reported pattern of estimates at the other time points or explain whether the repeated measurements were analyzed jointly. The timing and handling of missing observations across follow-up are also not reported.

Because the analysis population, missing-data approach, and multiplicity plan are unavailable, the confidence intervals cannot by themselves address those concerns. The posted estimates remain useful as the reported result, but their inferential interpretation is less complete than it would be with a transparent account of these analysis decisions.

11. Safety Results

The registry reports serious adverse events as affected participants divided by participants at risk.

Deaths

Other (non-serious) adverse events

Participants with at least one non-serious event at or above the registry's 5% reporting threshold.

The registry record lists serious adverse events for Primary Care Centers and Specialty Addiction Treatment Clinics. It reports 0 participants affected by serious adverse events in each group. The counts listed as at risk are 950 and 509, respectively. The record also lists 0 participants affected by other adverse events in both groups.

Deaths are recorded separately: 102 in Primary Care Centers and 49 in Specialty Addiction Treatment Clinics. These are counts in the registry record; the record does not establish that the deaths were caused by the intervention or provide a causal comparison. It does not report further details about causes, timing, relatedness, or the methods used to collect and classify adverse events.

A reported zero for affected participants means that no affected participants are listed for that category in this record. It does not prove that no events occurred outside the recorded definitions or observation process, and it does not establish the absence of risk. The listed group sizes are not a substitute for information about follow-up completeness or exposure time, which is not reported. Serious adverse event and death figures should therefore be read as registry counts, not as a complete assessment of comparative safety.

12. What the Result Does, and Does Not, Mean

The posted primary result shows adjusted average service-access percentages at 24 months for two reported care-setting categories. The average is 63.8 for Primary Care Centers and 54.7 for Specialty Addiction Treatment Clinics, with the respective 95% confidence intervals reported alongside those estimates. These values describe the endpoint as defined: the average percentage of recommended quality-health-indicator services accessed.

The result does not show that every participant received the same services, nor does it identify the services driving the averages. It is not a direct measure of HIV control, addiction outcomes, survival, quality of life, or stigma. Although the study brief includes those broader aims, the posted primary estimates do not answer those questions.

The record's planned design includes three groups, but the primary result reports two categories, and the relation between the planned primary-care groups and the posted primary-care category is not explained. The findings therefore cannot distinguish an effect associated with pay-for-performance incentives from an effect associated with primary care more generally. In addition, the adjustment method and analysis population are not reported, and no direct test or interval for the between-group contrast is listed.

Randomization is an important design feature, but a causal interpretation still depends on how groups were assigned, retained, analyzed, and represented in the reported comparison. The registry record does not include enough detail to resolve those questions. The result is best understood as a reported comparison of adjusted group averages, rather than a complete account of the mechanisms or consequences of changing the care setting.

Nothing in these estimates alone establishes whether a particular service model should be chosen. They describe service access in the record and should not be extended to unreported outcomes, other settings, or specific components of the intervention.

13. Why This Trial Matters Statistically

This trial raises a statistical question that matters for integrated care research: how to summarize access to a broad package of services when delivery is organized through different clinical settings. A composite percentage can represent the breadth of care more compactly than a long list of separate service outcomes. At the same time, the average can hide which parts of the package differ and whether participants experience similar levels of access.

The study brief describes a design involving regions and clinical settings, as well as three planned groups. Those features make clarity about the unit of randomization and the analysis of grouped data especially important. When participants are treated within common settings, their outcomes may be related. As a general statistical principle, an analysis should account for design features that affect dependence and uncertainty; the methods used in this record are not reported in enough detail to assess that point.

The mismatch in presentation between the three groups described in the brief and the two categories reported for the primary result is also important. Without an explanation of how categories map to assignment groups, readers cannot tell whether the reported primary-care estimate represents one planned arm or a combination. That ambiguity affects the question the result can answer, particularly for the planned incentive comparison.

Finally, a mean with a confidence interval is informative but incomplete without the analysis population, missing-data strategy, adjustment details, and a direct estimate of the group contrast. Transparent reporting of those elements would help readers judge precision and interpret the comparison in light of the randomized design. The posted result illustrates both the value of a concise composite endpoint and the need for clear reporting of how that endpoint is analyzed.

14. Limitations

• The posted summary statistics are the only data these results rest on; patient-level data, full protocols and statistical analysis plans are not available.
• Recalculated results are simple, unadjusted calculations from posted summaries. They do not replace the sponsor's prespecified analysis.

The primary result has important reporting limitations specific to this trial. The registry record describes three planned groups, but reports the primary outcome for two categories. It does not explain how the primary-care category relates to the planned primary-care groups with and without pay-for-performance. As a result, the posted comparison cannot isolate the incentive component or clarify whether the reported primary-care average combines planned arms.

The record describes the averages as adjusted but does not report the adjustment variables, model, or variance method. It also does not specify how the regional and clinical-setting structure was handled in the analysis, despite describing regions as clusters and identifying multiple clinical settings. The randomization unit and exact assignment procedure are not reported in enough detail to assess the analysis against the design.

There is no reported direct contrast estimate, confidence interval for the contrast, or p-value for the primary comparison. The record also does not describe the analysis population, missing-data handling, attrition, or sensitivity analyses. These gaps limit assessment of precision and potential bias. Although the outcome timeframe extends through 24 months with measurements every 6 months, the primary result description reports the 24-month adjusted averages and does not supply a trajectory for interpretation.

Finally, the composite endpoint does not reveal service-specific access, and the registry record does not report primary-result findings for quality of life, stigma, or the broader secondary outcomes named in the study brief. These limitations do not change the reported averages, but they constrain the conclusions that can be drawn from them.

15. Related Tutorials

16. Related Statistical Calculators

17. Sources

• ClinicalTrials.gov: Integrating Addiction Treatment and HIV Services Into Primary Care Clinics in Ukraine — NCT04927091.
• Registry record last updated 2026-09-23; status last verified 2026-08.
• Results first posted 2026-09-23.
• Data retrieved from ClinicalTrials.gov on 2026-11-09.
• Group sizes, means, event counts and sponsor-reported p-values are reproduced as posted. Effect estimates, confidence intervals and p-values not attributed to the sponsor are independently calculated from the posted summary statistics.

18. Record Summary

The registry record describes a completed, randomized, parallel-group trial with no masking, sponsored by Yale University. It lists 1590 enrolled participants and concerns HIV and opioid-use disorder. The study examines integration of addiction treatment and HIV services into primary care in Ukraine.

The primary endpoint is the adjusted average percentage of recommended Quality Health Indicator services accessed at 24 months. The posted result reports 63.8 for Primary Care Centers, with a 95% confidence interval of 62.3 to 65.3, and 54.7 for Specialty Addiction Treatment Clinics, with a 95% confidence interval of 52.8 to 56.6. The record does not explain how the two posted categories map to the three groups described in the study brief.

Details of the outcome model, adjustment, analysis population, missing-data handling, and multiplicity approach are not reported in the registry record. The estimates should therefore be read as the posted adjusted group averages, with those reporting limitations in mind.