Little Cigar and Cigarillo Warnings to Reduce Tobacco-Related Cancers and Disease - Eye Tracking: Complete Statistical Analysis

1. Trial at a Glance

This page covers the registry results for Little Cigar and Cigarillo Warnings to Reduce Tobacco-Related Cancers and Disease - Eye Tracking (NCT06546618), a na na study. The primary outcome is Attention to Warning Areas of Interest.

2. Clinical Question

3. Trial Design

The registry record describes a completed, single-group behavioral study of little cigar and cigarillo package stimuli. Enrollment was 90, and all participants viewed package images. The record says the stimuli were presented in random order and that 4 package conditions were repeated with 3 warnings applied to each, for 12 stimuli total. Random presentation order can reduce systematic order effects, but it does not make this a randomized comparison between participant groups.

The study varied two aspects of the package materials: warning type, pictorial versus text only, and flavor content, SWEET flavor descriptor versus no flavor descriptor. The stated goal was to assess how removing flavor descriptors affected attention and affective responses to warnings. Measurements were described as eye tracking, electrodermal activity, and surveys of affect. The listed intervention was LCC pack stimuli images, classified as behavioral.

The study had no masking, and allocation is recorded as NA. Its model is listed as single group. Accordingly, the conditions represent different stimuli viewed by participants, rather than a comparison of separately allocated treatment arms. The registry record identifies positive affect and negative affect as secondary outcomes. It describes the primary outcome as attention to warning areas of interest, measured in seconds during one time study appointment.

The record lists the study as completed and gives its start and primary completion dates, but does not provide further detail about the procedure, eligibility criteria, or how measurements were processed. A protocol-level statistical plan is not reported in the registry record. The record also reports zero analyses, so it does not provide an inferential analysis to interpret.

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: 90 participants arrived for their study appointment, began the study, and completed the study, which was a one-time appointment. All participants saw LCC pack stimuli images presented in random order, 4 package conditions were repeated with 3 warnings applied to each (12 stimuli total).

Overall Study

Analysis population for the primary outcome, as defined in the registry: All participants, mean response to the 3 package stimuli in each condition were combined consistent with the study hypotheses examining the difference between warning type (text vs. pictorial) and flavor (no flavor vs. "SWEET" flavor).

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: All Participants

6. Primary Endpoint

The registry lists the primary outcome as Attention to Warning Areas of Interest, measured over During one time study appointment.

The primary endpoint is a continuous measure of attention: mean dwell time, in seconds, directed to pre-defined areas of interest on the little cigar and cigarillo packages. The registry description refers to attention to warning areas and also specifies the mean time participants spend looking at the flavor area of interest for the 3 packages in each condition. The population description says mean responses to the 3 package stimuli in each condition were combined to examine warning type and flavor.

Eye tracking provides a behavioral measure of where and for how long a participant looks. Dwell time can therefore describe visual attention to selected package regions, rather than relying only on a participant’s later recollection or stated impression. It does not, by itself, establish what a participant understood, remembered, or would do outside the study appointment. Those are different constructs and are not reported as primary outcomes.

In general, a mean gives a summary of the measured values, while a standard deviation describes how spread out those values are around the mean. The registry lists standard deviation as the measure of dispersion. The result values themselves are not reported in the registry record, so the average attention time and its variability cannot be assessed from this record.

7. Why No Re-analysis Is Shown

8. Statistical Interpretation

9. Statistical Methods Explained

What does dwell time measure?

The primary measure is dwell time to pre-defined areas of interest on package images, expressed in seconds. Eye tracking records visual gaze, and dwell time summarizes how long gaze is directed to a selected region. In this study, the regions relate to package warnings and flavor information. The registry description specifically mentions mean time spent looking at the flavor area of interest for the 3 packages in each condition, while the primary outcome title refers to attention to warning areas of interest. The exact operational details of the areas and processing are not reported in the registry record.

In general, an eye-tracking measure is an indicator of visual attention, not a direct measure of comprehension, memory, or behavior. A longer dwell time can describe more time looking at a region, but its meaning depends on the study question and the way the area of interest was defined. The registry record does not report those additional interpretations or any outcome values.

How should a mean and standard deviation be read?

The outcome is described as a mean, with standard deviation as its dispersion measure. In general, a mean summarizes the center of a set of continuous measurements. A standard deviation describes how much individual measurements vary around that mean. Reporting both helps readers understand the typical measured value and the spread of participant responses. Neither value is reported for the primary outcome in the registry record.

Because participants viewed multiple stimuli, the observations may be related within each participant. In general, repeated measurements from the same person are not automatically equivalent to measurements from different people: responses from one person can share characteristics. Appropriate analysis often accounts for this dependence. The registry record does not report whether or how the analysis addressed repeated measurements, nor does it give an analysis model.

What does the stimulus order tell us?

The registry says package stimuli were presented in random order. In general, randomizing presentation order can help avoid a consistent sequence in which one stimulus is always encountered first or last. It does not establish random allocation to participant groups. This study is listed as single group, with allocation NA, and the record describes all participants viewing package stimuli. The exact procedure used to generate or implement the order is not reported in the registry record.

What can confidence intervals and tests add?

In general, a confidence interval gives a range of values compatible with the data and the method used to calculate it. Its width conveys statistical precision: narrower intervals indicate more precision under the stated method, while wider intervals indicate greater uncertainty. A statistical test addresses a particular hypothesis under its assumptions. Neither a confidence interval nor a test result replaces the estimated effect or its practical interpretation.

The registry record lists zero analyses and does not report an estimate, confidence interval, or p-value for the primary outcome. It also does not report the statistical methods used for secondary outcomes. It is therefore not possible to assess statistical significance, precision, or the analysis assumptions from the record.

How do the planning illustrations differ from results?

The sample-size assumptions describe a planning illustration computed from the observed effect, not the trial’s own design. The stated assumptions are a two-sided significance level of 0.05, equal allocation between two arms, and a normal approximation; the effect to detect is a stated fraction of the observed effect. The record also specifies that non-time-to-event illustrations give participants per arm, while time-to-event illustrations give total events.

In general, a planning calculation asks how much information might be needed to detect a specified effect under chosen assumptions. It is not an observed study result and is not observed power. The actual study is single group, so the illustrative equal allocation between two arms does not describe its participant allocation. No sample-size illustration values are reported in the registry information summarized for this analysis.

The registry does not report the assumptions or procedures for handling missing measurements, selecting analyses, adjusting for multiple outcomes, or examining subgroups. Those omissions limit the ability to evaluate the statistical analysis plan. General statistical principles can explain why such details matter, but they cannot establish what procedures this study used.

10. Multiplicity, Missing Data and Analysis Populations

The registry identifies attention to warning areas as the primary outcome and positive affect and negative affect as secondary outcomes. It also reports 4 outcome measures and zero analyses. The record does not describe a multiplicity adjustment, a hierarchy for testing outcomes, or which contrasts were designated as confirmatory. When many outcomes or comparisons are examined, the chance of finding an apparently notable result by chance can increase; in general, a prespecified strategy helps readers interpret that risk. The strategy for this study is not reported in the registry record.

Missing-data methods are not reported in the registry record. The record does not state whether participants had incomplete eye-tracking or survey measurements, how missing observations were handled, or whether any sensitivity analyses were performed. Without this information, readers cannot assess whether available measurements might differ systematically from measurements that were not available.

The analysis population is described broadly as all participants, and the outcome description says responses to the 3 package stimuli in each condition were combined. The record does not provide a detailed analysis-population definition, participant flow, or counts contributing measurements to each outcome. It also does not report how observations from multiple stimuli per participant were handled statistically. These details matter for understanding the denominator and the uncertainty of estimates, but no such methods or result counts are reported in the registry record.

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 0% reporting threshold.

The serious adverse event record lists 90 participants at risk and 0 affected among all participants. It also records 90 participants at risk and 0 affected for the other adverse-event category, and 0 deaths. No serious adverse-event terms are listed.

These figures describe what the registry record reports for this study; they are not a statistical comparison between groups. The design is single group, and the record does not identify a separate control arm. A zero count in the recorded categories means that no affected participants or deaths are listed in those fields. It should not be expanded into a claim about unrecorded symptoms, risks, or outcomes.

The registry information does not report further detail about the adverse-event collection procedure, event definitions, observation period for safety, or completeness of reporting. The study describes a one-time appointment involving package stimuli and measurement procedures, but the safety figures should be interpreted only as registry entries, not as a comprehensive account of all possible events.

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

The registry record establishes that a completed study enrolled 90 participants and assessed responses to little cigar and cigarillo package images. It describes package conditions that varied warning type and flavor descriptors, random stimulus order, and measurement of attention and affect. These details identify the research question and the kind of observations collected.

The record does not report numerical results for the primary attention endpoint or for positive and negative affect. It therefore does not establish the size or direction of differences between conditions, how variable responses were, or how precisely any contrast was estimated. It also does not report inferential analyses. No conclusion about the presence, absence, or practical importance of a difference can be drawn from the design description alone.

In general, attention measured by eye tracking is one response to a stimulus. It is not, by itself, evidence about comprehension, memory, purchasing, tobacco use, or health outcomes. The study’s stated goal concerns attention and affective responses to package warnings and flavor descriptors; the registry information does not report outcomes beyond those measures.

The study’s single-group design also matters for interpretation. Participants viewed different stimuli, but the record does not describe separate participant groups allocated to competing conditions. Randomizing stimulus order does not turn the study into a randomized treatment comparison. Any interpretation of condition differences would require the outcome estimates and an analysis appropriate to the repeated observations.

The findings cannot be characterized as showing that a warning or package feature does or does not work. The registry record provides no numerical outcome results with which to evaluate that question. Its contribution in the available record is the description of a behavioral study and its intended measurements, not an interpretable estimate of effect.

13. Why This Trial Matters Statistically

This study raises a statistical question about how to compare attention across multiple package stimuli while accounting for the fact that the same participants view those stimuli. That structure differs from a simple comparison of independent participant groups. Clear reporting of the unit of analysis, repeated-measure handling, and the specific contrasts would be important for interpreting any estimated differences. Those analysis details are not reported in the registry record.

The outcome is continuous dwell time, summarized as a mean with standard deviation. Such measures can show both an average level of visual attention and variation among participants. In general, a mean alone may hide substantial variation, while a dispersion measure helps describe how consistent or heterogeneous responses are. The record does not provide the endpoint values needed to make that assessment.

The study also considers more than one response domain: attention and affect. In general, evaluating multiple outcomes or contrasts raises questions about which findings were planned in advance and how multiplicity was handled. The registry record does not report that strategy or any analyses, limiting the reader’s ability to distinguish confirmatory from exploratory findings.

Finally, the distinction between randomized stimulus order and randomized group allocation is essential. The study is recorded as single group, with no like-for-like control arm. That design can address responses to varied stimuli as described, but its interpretation depends on the stimulus-level analysis and the limits of the measured outcomes. The absence of posted estimates means the record cannot support a quantitative judgment about the observed responses.

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 registry information does not report numerical results for the primary outcome or the secondary affect outcomes. It also lists zero analyses. This is the central limitation for statistical interpretation: without estimates, variability, and analysis results, the size, direction, and precision of any differences cannot be evaluated.

The design is single group, not a randomized comparison between participant groups. Participants viewed stimuli in random order, but the record does not explain how repeated responses from the same participant were incorporated into analyses. The exact stimulus-level contrasts and statistical model are not reported in the registry record.

The primary outcome description refers both to attention to warning areas and to mean time looking at the flavor area of interest. Although the study question concerns warning type and flavor, the record does not provide further operational details about the areas of interest or how those measurements were derived. It also does not provide outcome-specific participant counts or a detailed analysis-population definition.

Eligibility criteria, participant characteristics, missing-data procedures, multiplicity handling, and the statistical analysis plan are not reported in the registry record. The lack of those details limits assessment of generalizability, potential bias from incomplete measurements, and the reliability of any unreported comparisons. These limitations concern the information available in the record and do not establish what procedures may have been used outside it.

15. Related Tutorials

16. Related Statistical Calculators

17. Sources

• ClinicalTrials.gov: Little Cigar and Cigarillo Warnings to Reduce Tobacco-Related Cancers and Disease - Eye Tracking — NCT06546618.
• Registry record last updated 2026-07-02; status last verified 2026-06.
• Results first posted 2026-07-02.
• 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, single-group behavioral eye-tracking study of little cigar and cigarillo package warnings and flavor descriptors. It reports enrollment of 90 participants. All participants viewed package images presented in random order: 4 package conditions were repeated with 3 warnings applied to each, for 12 stimuli total.

The primary outcome was attention to warning areas of interest, measured as mean dwell time in seconds, with standard deviation specified as the dispersion measure. Positive affect and negative affect are listed as secondary outcomes. The study description also mentions electrodermal activity and survey measures of affect.

The registry record lists 4 outcome measures and zero analyses. It does not report numerical results for the primary or secondary outcomes, an inferential analysis, missing-data procedures, or a multiplicity strategy. Serious adverse event fields list 0 affected participants and 0 deaths. The reported information supports a description of the study design and measurements, but not a quantitative interpretation of outcome differences.