Study design
The mood study uses a prospective, repeated-measures
design. Each participant served as their own control: mood
was recorded immediately before and immediately after the same dance
class session, repeatedly across the study period (February–May
2025). The design supports inference about within-session
change in mood. As stated in the published paper:
“the observational design precludes causal attribution.”
The design does not support claims about long-term well-being,
character, or development — questions we treat as separate.
Instrument
The primary measure was a single-item emoji scale,
administered on iPad immediately before and after each class. The
brief format keeps response burden minimal for young dancers across
the full age range and enables high-frequency, in-context (ecological
momentary) assessment of mood.
To assess whether the emoji scale captures something meaningful, we
also administered the PANAS-C (Positive and Negative
Affect Schedule for Children, a validated published instrument) to a
subset of participants. The emoji scale showed significant
convergent validity with PANAS-C Positive Affect
(r = .19, p = .011, n = 175), with the
strongest correlation among students attending 4–6 classes per
week (r = .51, n = 25). In plain English: the
quick emoji rating tracks the kind of mood the longer, validated
PANAS-C measures — especially for more-involved dancers.
Sample and sites
The published study reports data from 256 children and
adolescents at four studio locations,
measured during February through May 2025.
Participants completed 4,224 paired pre- and post-class
mood ratings; the primary analytic sample comprised
4,059 sessions from 251 students. Participants
ranged in age from 5 to 17, with parental consent
on file under IRB Protocol #857840.
Participation in the research was open to any consenting dance
student at a participating studio, regardless of whether they
were also enrolled in the Raising the Barre youth-leadership
program. Research participants and RTB program participants are
two different groups.
| Measure | Value |
| Students measured | 256 |
| Paired pre/post ratings | 4,224 |
| Primary analytic sessions | 4,059 |
| Sessions: maintained or improved | 85.8% |
| Session-level effect (Cohen’s d) | 0.27 |
| Per-student effect (Cohen’s dz) | 0.43 |
| Statistical significance | p < .001 |
| Intraclass correlation (ICC) | .432 |
Analysis
The data were analyzed using multilevel models to
account for the nested structure (sessions nested within students;
students contributed between 1 and 109 sessions each). The
intraclass correlation (ICC = .432) indicated that a substantial
share of variation was between students rather than within them
— a finding that meaningfully shapes how to read the results.
A Tobit sensitivity analysis was used to confirm
the results after adjusting for a 28.8% post-class ceiling rate
(dancers reporting the maximum mood rating after class).
Random-slopes models substantially improved model fit
(ΔAIC = 201), indicating that dancers’ individual
responses to dance class varied meaningfully — the
same class affects different dancers differently.
No covariate — including weekly class frequency, class type,
proficiency level, or instructor experience — explained
significant additional variance. The full statistical methodology
is documented in the accepted manuscript at
Frontiers in Psychology.
Strengths and limits
The within-subject, repeated-measures design is a real strength: it
controls for stable individual differences and supports inference
about within-session change. Sample size and session count are both
large for a study of this kind in a real-world (non-laboratory)
setting. Convergent validity with a published instrument (PANAS-C)
provides external grounding for the brief emoji measure.
At the same time, this is observational research
conducted in real dance studios, not a randomized controlled trial.
The paper’s own conclusion is direct: “the
observational design precludes causal attribution.”
The dancers in our data chose to attend dance class; we cannot
rule out selection effects, and self-report mood scales carry
known limitations. The acute mood effect we observe is an effect
per session, not a claim about cumulative benefits over
months or years.
What this study does not claim
We do not claim that dance class causes long-term changes in
well-being, character, leadership, or academic outcomes. Those are
separate questions, and answering them rigorously would require
different study designs — ones we are actively pursuing
through the Stanford executive function collaboration and through
future longitudinal work.