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Canadian and Brazilian Percentile Ranks for the Alberta Infant Motor Scale

Natália Alves Menegol1, Dayane Montemezzo1, Anilsa Suraya Gaspar Francisco Gulonda1

  • 1Department of Physical Therapy, Universidade do Estado de Santa Catarina, Florianópolis, SC, Brazil.

Physical & Occupational Therapy in Pediatrics
|May 11, 2022
PubMed

Insights

Brazilian infants show different motor development percentile ranks compared to Canadian norms using the Alberta Infant Motor Scale (AIMS). These variations impact identifying developmental milestones.

Area of Science:

  • Pediatrics
  • Developmental Pediatrics
  • Motor Development

Background:

  • The Alberta Infant Motor Scale (AIMS) is a widely used tool for assessing infant motor development.
  • Established norms are crucial for accurate interpretation of developmental assessments.
  • Previous research has not extensively compared AIMS percentile ranks between Brazilian and Canadian infant populations.

Purpose of the Study:

  • To investigate differences in AIMS percentile ranks between Brazilian infants and established Canadian norms.
  • To compare AIMS percentile ranks derived from different Brazilian normative studies.
  • To assess the potential impact of these differences on the identification of motor development in Brazilian infants.

Main Methods:

  • A cross-sectional study involving 322 Brazilian infants aged 2 to 15 months.
  • Administration of the Alberta Infant Motor Scale (AIMS).
  • Calculation and comparison of percentile ranks using Canadian norms and two Brazilian normative datasets, employing Friedman test, interclass correlation coefficient (ICC), and Bland Altman analysis.

Main Results:

  • Significant differences (p<.001) were found between the three sets of percentile ranks analyzed.
  • Canadian norms yielded the lowest average AIMS scores for the Brazilian sample.
  • While reliability between percentile ranks was good (ICC > 0.75), agreement was low (Bland Altman; p<.001).

Conclusions:

  • There are statistically significant differences between AIMS percentile ranks for Brazilian infants when compared to Canadian norms.
  • Discrepancies also exist between different Brazilian normative data sets for the AIMS.
  • These variations underscore the importance of using appropriate, culturally relevant norms to accurately identify motor development in infants.

Keywords:
Motor development. Gross motor development. Alberta Infant Motor Scale. Percentile Rank. Reproducibility of Tests

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