A Study on the Use of the MMF07 Foot Massager and Heat Therapy Treatments for Restless Leg Syndrome: Complete Statistical Analysis

1. Trial at a Glance

This page covers the registry results for A Study on the Use of the MMF07 Foot Massager and Heat Therapy Treatments for Restless Leg Syndrome (NCT02526277), a randomized na study. The primary outcome is The International Restless Legs Severity Scale.

2. Clinical Question

3. Trial Design

This was a randomized, prospective study with a factorial model and single masking. The registry record does not identify who was masked, so the meaning of single masking cannot be specified further. The planned groups were massager alone, heat therapy alone, both interventions, and no treatment. The record lists 28 participants as the enrollment and labels the study completed. It gives a start date of 2016-01-06 and a primary completion date of 2018-09-25.

Participants assigned to the massager group were provided the MMF07 Foot Massager and instructed to use it for 30 minutes at bedtime, beginning at setting 3 and adjusting the setting to their comfort. Participants assigned to heat therapy received an electric heating pad and were instructed to use it at a medium setting for 30 minutes at bedtime. The combination group received both devices, but the complete use instructions for that group are not reported in the registry record. Participants assigned to no treatment were asked not to alter their nighttime routine.

The primary outcome was the International Restless Legs Severity Scale at 4 weeks. The listed outcome parameter is the mean, with standard deviation as the measure of dispersion. Two secondary outcomes are named: the Restless Legs Quality of Life Questionnaire and changes in sleep measured by the Medical Outcomes Sleep Study Scale at Week 4. Their numerical results are not reported in the registry record in the registry record for this analysis. The record does not describe allocation concealment, the method used to generate the random sequence, adherence, or deviations from assigned treatment. Specific details of these design features are not reported in the registry record.

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.

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.

6. Primary Endpoint

The registry lists the primary outcome as The International Restless Legs Severity Scale, measured over 4 weeks.

The primary endpoint is the International Restless Legs Severity Scale score at 4 weeks. Participants answer 10 questions, each scored from 0 to 4, and the points are added. The possible total ranges from 0 to 40; higher scores are associated with more severe symptoms. The registry reports the outcome as a mean score with standard deviation.

A severity scale provides a consistent way to represent symptom burden numerically. In a randomized study, comparing outcome scores between assigned groups can help describe whether their observed symptom levels differ. The scale’s direction is important when interpreting results: a higher score represents more severe symptoms, not better status. A group mean describes the average score among the participants represented in that arm, while the standard deviation describes variation in individual scores around that mean.

The posted record gives arm-level values at the 4-week time point, but does not report baseline scores or a baseline-adjusted analysis. It also does not report a prespecified clinically important difference or explain how a change on this scale would be judged meaningful to participants. Therefore, the numerical scale can be interpreted in its stated direction, but the registry record does not establish the clinical importance of any difference between groups.

7. Why No Re-analysis Is Shown

8. Statistical Interpretation

9. Statistical Methods Explained

Continuous outcomes are commonly summarized using a mean and standard deviation. The mean represents the arithmetic average of participants’ scores in a group. The standard deviation describes how spread out individual scores are around that average. Neither statistic alone answers whether two randomized groups differ statistically, and a standard deviation is not the same as the standard error or a confidence interval.

What does a confidence interval communicate?

In general, a confidence interval expresses uncertainty around an estimated quantity, such as a difference between group means. Its width depends on the amount and variability of the data and on the method used. A narrow interval indicates greater precision than a wide one, while an interval spanning values in different directions can leave the direction and magnitude of an effect uncertain. No confidence interval for a between-group contrast is reported in the registry record for this outcome.

Why are arm means not a treatment-effect analysis?

The posted means describe each group separately. A treatment-effect analysis would specify a contrast, such as a difference between assigned groups, and quantify its uncertainty using a statistical method. The registry record does not provide such an estimate or a test for the primary endpoint. It is therefore not appropriate to infer statistical significance by visually comparing the four means or by considering their standard deviations alone. An unadjusted re-calculation is not reported for this endpoint; the record identifies missing values or non-estimability for a two-arm comparison of this continuous outcome.

How does the factorial design affect interpretation?

A factorial design assigns participants across combinations of interventions. In principle, it can be used to estimate effects associated with each intervention and to examine whether the effect of one depends on the presence of another. The analysis must define the contrasts and account for the design. Here, four groups are described, and the registry labels the model factorial, but the statistical comparisons and any interaction assessment are not reported in the registry record. The group means by themselves cannot determine whether the interventions have independent or interacting effects.

What does over-dispersion mean in general?

Over-dispersion is a general issue for outcomes whose variability is larger than a chosen statistical model assumes. If a model does not accommodate the actual variation, standard errors and uncertainty estimates may be unreliable. This endpoint is reported as a continuous score with group standard deviations, but no fitted model or variance assumption is reported. The registry record therefore does not allow assessment of whether over-dispersion was evaluated or relevant to the sponsor’s analysis.

How should the planning illustrations be understood?

The stated planning approach is an illustration based on an observed effect, not the trial’s original design justification. It assumes a two-sided significance level of 0.05, equal allocation between two arms, and a normal approximation, with the effect to detect set as a stated fraction of the observed effect. Such illustrations describe hypothetical participant requirements under their assumptions; they are not observed power and do not establish the study’s original planned sample size. The registry record does not report the trial’s sample-size justification. No numerical planning outputs are available in the registry record details used for this analysis.

More generally, planning calculations depend on the endpoint, target effect, outcome variability, allocation, and analysis method. Changing an assumed effect changes the hypothetical planning requirement. Because the primary endpoint’s comparative effect estimate and uncertainty are not reported, the planning assumptions should not be mistaken for evidence that the study had adequate power to detect a particular effect. The observed enrollment and arm sizes describe the participants in the posted results, not the outcome of a prospective power calculation.

What can be inferred from the posted analysis information?

The record lists no analyses. It also provides arm-level outcome summaries, which are descriptive information, but no reported inferential result for the primary comparison. This distinction matters: descriptive results can show the observed scores in the recorded groups, whereas inferential analyses address uncertainty about contrasts and the population from which the participants arose. Without reported methods, estimates, and uncertainty, the appropriate interpretation remains descriptive.

10. Confidence Intervals for Each Arm

No two-arm comparison is shown for this trial, but each arm's mean can be given with a t-based 95% confidence interval computed from the posted mean, spread and number of participants.

R code and output

arm <- c("Heat Therapy", "MMF07 Foot Massager Device", "MMF07 Foot Massager Device and Heat Therapy", "No Treatment")
n   <- c(6, 8, 7, 7)
m   <- c(17.3, 12.3, 16.9, 21.3)
sp  <- c(8.1, 4.2, 6.2, 8.5)
sd  <- sp      # posted standard deviations
for (i in seq_along(n)) {
  se <- sd[i] / sqrt(n[i]); h <- qt(0.975, n[i] - 1) * se
  cat(sprintf("CARM|%s|%d|%.3f|%.3f|%.3f|%.3f\n", arm[i], n[i], m[i], sd[i], m[i] - h, m[i] + h))
}

CARM  Heat Therapy  6  17.300  8.100  8.800  25.800
CARM  MMF07 Foot Massager Device  8  12.300  4.200  8.789  15.811
CARM  MMF07 Foot Massager Device and Heat Therapy  7  16.900  6.200  11.166  22.634
CARM  No Treatment  7  21.300  8.500  13.439  29.161

11. Multiplicity, Missing Data and Analysis Populations

The study lists one primary outcome and two secondary outcomes. The registry record does not report a multiplicity strategy, such as a prespecified hierarchy, adjustment across outcomes, or a decision to treat secondary analyses as exploratory. When several outcomes or comparisons are tested, the chance of at least one apparently unusual result can increase; general methods for handling this depend on the study’s objectives and analysis plan. No such plan is reported in the registry record, so the impact of multiplicity cannot be assessed.

The secondary outcomes named are the Restless Legs Quality of Life Questionnaire and changes in sleep measured by the Medical Outcomes Sleep Study Scale at Week 4. Numerical secondary-outcome results are not reported in the registry record in the registry record for this analysis. The registry record does not report which comparisons were intended for these outcomes or how missing secondary data were handled.

Missing outcome data, reasons for missingness, and imputation methods are not reported in the registry record. The analysis population—such as whether results used all randomized participants or only participants with observed outcomes—is also not reported. The primary outcome arm sizes are listed, but the record does not explain whether these represent all randomized participants, participants assessed at 4 weeks, or another analysis population. Without this information, it is not possible to assess attrition, potential bias from missing data, or how closely the analysis followed randomized assignment.

The registry record lists zero analyses. It does not report an analysis plan, interim analyses, or sensitivity analyses. These omissions do not establish that such procedures were or were not carried out; they mean that the relevant details are not reported in the registry record.

12. 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 0% reporting threshold.

Most frequent non-serious adverse event terms

The safety figures distinguish serious adverse events, other adverse events, and deaths. For serious adverse events, the registry reports zero affected participants in each of the four groups: MMF07 Foot Massager Device, Heat Therapy, MMF07 Foot Massager Device and Heat Therapy, and No Treatment. The numbers at risk were 8, 6, 7, and 7, respectively. The record also reports zero deaths in every group.

For other adverse events, the numbers affected were 4 in the massager group, 0 in the heat therapy group, 4 in the combination group, and 1 in the no-treatment group. The corresponding numbers at risk were 8, 6, 7, and 7. These are counts of participants affected, as reported; the registry record does not give event descriptions or severity details for these other events. The serious adverse event terms list is empty.

Zero reported serious adverse events in these groups means none were recorded among the participants represented in the safety data. It does not show that serious events are impossible, nor does it establish that the interventions are safe. The group sizes are small, and the registry record does not report monitoring duration beyond the study outcome timing, completeness of safety follow-up, or a detailed safety analysis. These figures should be read as the posted event counts, not as a definitive comparison of safety between assignments.

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

The posted data describe a small randomized study of four assignments for people with restless legs syndrome: the MMF07 Foot Massager, heat therapy, both, and no treatment. The primary outcome was the International Restless Legs Severity Scale score at 4 weeks. The registry reports group means and standard deviations, allowing readers to see the observed score summaries and their variation.

The data do not establish whether any assignment changed symptoms or differed from another assignment. No comparative effect estimate, confidence interval, or p-value is reported in the registry record, and the record lists zero analyses. Differences between the reported group means cannot by themselves distinguish a treatment effect from random variation. No baseline scores or clinically important difference are reported, further limiting interpretation of the size and relevance of any observed separation.

The factorial label indicates a design involving combinations of interventions, but the registry record does not report the statistical contrasts or interaction analysis. The arm summaries therefore do not answer whether heat therapy and the massager each had a separate effect, whether their combination behaved differently, or how either compared formally with no treatment.

The safety data report no serious adverse events and no deaths in the posted groups, alongside counts of other adverse events. These are descriptive counts in the recorded participants and are not enough to establish comparative safety. The secondary outcomes are named, but their numerical results are not reported in the registry record.

In short, the record offers descriptive endpoint and safety information for the study groups, but not a reported inferential analysis. It cannot establish a treatment effect, rule one out, or determine the precision of between-group differences. These conclusions are about what the registry record reports, not a clinical recommendation.

14. Why This Trial Matters Statistically

This trial is statistically instructive because its randomized, four-group structure makes the distinction between a design and an analysis especially clear. A factorial label describes how intervention combinations are organized, but a reader still needs the planned contrasts, model, and uncertainty estimates to interpret effects. Without those reported analyses, the arm-level summaries remain descriptive.

The primary endpoint is a continuous severity score, and the registry reports means and standard deviations. Those summaries are useful for describing the participants’ scores, but they do not substitute for an estimate comparing assignments. Reporting a confidence interval alongside a contrast would help readers judge how precisely the data estimate a difference. The registry record does not report that information for the primary outcome.

The study also illustrates why sample size and precision matter when interpreting small randomized groups. The total enrollment was 28, distributed across four arms. A numerical difference between means may be compatible with substantial uncertainty, particularly when individual scores vary. Since no comparative intervals or tests are reported, the amount of uncertainty cannot be quantified from the registry outcome summaries.

Finally, several elements relevant to reproducibility are not reported in the registry record: the analysis population, handling of missing data, multiplicity approach, and specific factorial contrasts. These details connect the original design to the claims that can be made from the results. Their absence makes cautious descriptive interpretation more appropriate than treating the group ordering as evidence of a confirmed intervention effect.

15. 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 registry record provides limited information for evaluating the primary outcome beyond arm-level means, standard deviations, and group sizes. It does not report baseline scores, a comparative effect estimate, confidence intervals, p-values, or a formal analysis method. Consequently, the magnitude and precision of any between-group contrast cannot be assessed from the record.

Although the model is described as factorial, the record does not specify the contrasts used to estimate intervention effects or whether an interaction between the massager and heat therapy was assessed. The combination-arm instructions are incomplete in the registry record, and it does not report adherence or treatment fidelity. The identity of the masked party is also not reported.

The record does not report participant characteristics beyond the RLS condition, or explain how participants were selected. Generalizability to populations with different characteristics or settings is therefore difficult to assess. Allocation concealment and the randomization procedure are not reported. These missing design details limit assessment of potential selection and measurement biases.

Missing outcome data, attrition, reasons for missingness, the analysis population, and methods for handling missing observations are not reported in the registry record. The secondary outcomes are identified, but their numerical results are not reported in the registry record for this analysis. The record also does not report a multiplicity approach, a sample-size justification, or interim and sensitivity analyses.

Safety reporting is limited to counts of affected participants, with no descriptions for the other adverse events and no detailed safety analysis. The reported zero serious adverse events and zero deaths should therefore be understood as counts in the posted groups, not as evidence that rare risks were excluded.

16. Related Tutorials

17. Related Statistical Calculators

18. Sources

• ClinicalTrials.gov: A Study on the Use of the MMF07 Foot Massager and Heat Therapy Treatments for Restless Leg Syndrome — NCT02526277.
• Registry record last updated 2021-01-28; status last verified 2021-01.
• Results first posted 2020-02-18.
• 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.

19. Record Summary

The registry record describes NCT02526277, a completed randomized, prospective study of the MMF07 Foot Massager and heat therapy for restless legs syndrome. The design is labeled factorial and single masked; the masked party is not identified. Enrollment was 28. The record lists four groups: massager, heat therapy, both interventions, and no treatment.

The primary outcome was the International Restless Legs Severity Scale mean score at 4 weeks, reported with standard deviations. The arm-level results were 17.3 for Heat Therapy, 12.3 for MMF07 Foot Massager Device, 16.9 for the combination, and 21.3 for No Treatment. The registry record does not report a comparative analysis, confidence interval, or p-value. It names two secondary outcomes, but their numerical results are not reported in the registry record.

Serious adverse events and deaths were reported as zero in each group. Other adverse event counts varied across groups. Analysis methods, missing-data handling, multiplicity procedures, and the original sample-size justification are not reported in the registry record.