Methodology Study Design This study is a cross-sectional observational case-control study
designed to generate hypotheses.
The STROBE guidelines will be followed to ensure methodological rigor and transparency in
reporting results.
Study Population and Setting The cohort will include children aged 4 to 11 years with
typical or atypical neurodevelopment (ASD, ADHD, or DCD).
Participants
Inclusion Criteria:
Children aged 4 to 11 years.
Typical or atypical neurodevelopment, defined as follows:
ASD: Subclinical symptoms or Level 1 diagnosis. ADHD: Predominantly inattentive,
hyperactive/impulsive, or combined presentation. For children under 6, typical symptoms
of the disorder (e.g., impulsivity, hyperactivity).
DCD: Diagnosed or meeting the following criteria:
Motor skills below age expectations. Significant impact on daily activities or school
performance. Difficulties not attributable to another condition. Parental/legal guardian
consent.
Exclusion Criteria:
Moderate to severe intellectual disability (IQ ≤ 51). Neurological disorders (e.g.,
cerebral palsy) or syndromes. Severe visual and/or auditory impairments. Severe
behavioral disorders. Severe mental health disorders (e.g., depression, severe anxiety).
Participant Recruitment Recruitment will occur between September and October 2024.
Atypical neurodevelopment cases will be recruited from CDIAP Tris Tras, Neuro Xics, and
Criv, with service coordinators pre-informed and trained in study procedures and
eligibility criteria. Coordinators will review criteria among their clients, provide
study details to parents/legal guardians, and share an information sheet and video link
explaining the project.
Typical neurodevelopment controls will be recruited from the local community around the
research team. Recruitment will follow the same procedure as for atypical cases.
Parents/legal guardians will have 2-5 days to review the study details and sign an
informed consent form via Microsoft 365 Forms, ensuring secure data collection.
Sample Size Due to the exploratory nature of this undergraduate project and resource
constraints, a formal sample size calculation was not performed. The target is 15
controls (typical neurodevelopment) and 15 cases (5 each for ASD, ADHD, and DCD). This
sample size is expected to provide a basis for exploring group-specific dynamics and
patterns for future studies.
Variables and Data Collection Independent Variables
Parental Demographics: Age, education level, origin, number of children. Child
Demographics: Age, gestational age, birth weight, family type, development type
(typical/atypical with diagnosis).
Dependent Variables
Primary Variable:
Motor skills, assessed using the Movement Assessment Battery for Children-Second Edition
(MABC-2). This standardized tool evaluates manual dexterity, coordination, and balance
through age-adjusted scores. Evaluations will be video-recorded for consistency and
scored by trained researchers.
Secondary Variable:
Sensory processing, assessed using the Short Sensory Profile-2 (SSP-2), a
caregiver-reported questionnaire evaluating sensory patterns across various domains.
Statistical Analysis Descriptive statistics will summarize quantitative variables using
means/standard deviations and medians/interquartile ranges. Categorical variables will be
reported as frequencies and percentages. Baseline comparisons will use Student's t-tests
or ANOVA for quantitative variables and Chi-square tests for categorical data.
Multivariate analyses will use mixed-effects linear models to evaluate primary outcomes,
controlling for significant covariates. Statistical significance is set at p < 0.05.
Ethical Considerations The protocol was approved by the UVic-UCC Research Ethics
Committee. The study complies with the Declaration of Helsinki and data protection laws
(GDPR and Spanish Organic Law 3/2018).
Parents/legal guardians will receive information sheets and sign informed consent forms.
Participation is voluntary, and participants can withdraw at any time without
consequences. Video recordings will be securely stored and used solely for study
purposes, with images anonymized and deleted after evaluation.