Convergent validity of two adult self-report sensory scales: Comparing the Adolescent/Adult Sensory Profile and the Sensory Processing Measure 2-Adult Form.

Introduction: Occupational therapists use standardised scales and measures to assess an individual's sensory processing factors. To date, few studies have investigated the correlations between the Adolescent/Adult Sensory Profile (A/ASP) and the Sensory Processing Measure 2-Adult Form (SPM-2-Adult). The aim of the project is to investigate the association between the sensory processing factors measured by the A/ASP and SPM-2-Adult when completed by the same group of adult participants, with an additional research question investigating whether any significant differences existed between sensory processing scores based on participants' self-reported gender identity.

Methods: Forty-two adults aged 18-30 completed the A/ASP and the SPM-2-Adult. Associations between the A/ASP quadrant and the SPM-2-Adult subscales were examined using Spearman's rho correlation coefficients, and differences between participants based on their self-reported gender identity were investigated using Mann-Whitney U tests.

Results: Statistically significant correlations were obtained between the A/ASP Low Registration, Sensory Sensitivity, and Sensation Avoiding quadrant subscales and all nine of the SPM-2-Adult subscales ranging from weak (rho = 0.342, p < 0.027) to strong (rho = 0.790, p < 0.001) correlations. The A/ASP Sensation Seeking quadrant subscale was only significantly correlated with the SPM-2-Adult Social Participation subscale (rho = -0.416, p = 0.006). Three subscales had statistically significant differences based on gender identity: SPM-2-Adult Vision (p = 0.007), SPM-2-Adult Sensory Total (p = 0.048), and A/ASP Sensory Sensitivity (p = 0.043).

Consumer and community involvement: Consumers and community members were not involved in the design, execution, or write-up of the study results.

Conclusion: The A/ASP and the SPM-2-Adult had several subscales that were significantly correlated with one another. Of note, significant associations were achieved between the A/ASP Low Registration, Sensory Sensitivity, and Sensation Avoiding quadrant subscales and all nine of the SPM-2-Adult subscales. These findings make a significant preliminary contribution to the psychometric body of evidence related to the sensory processing assessment of adults.